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Robert Ledley Papers

Creator:
Ledley, Robert S.  Search this
National Biomedical Research Foundation. Georgetown University  Search this
Names:
Automatic Computerized Transverse Axial Scanner  Search this
Computer-Assisted Tomography Scanner  Search this
National Biomedical Research Foundation. Georgetown University  Search this
Extent:
3 Cubic feet
Type:
Collection descriptions
Archival materials
Manuals
Patents
Photographs
Design drawings
Correspondence
Articles
Diagrams
Slides (photographs)
Notes
Motion pictures (visual works)
Albums
Date:
1972-1990
Summary:
The Robert Ledley Papers document the development of the first whole-body diagnostic imaging system, the Automatic Computerized Transverse Axial (ACTA) X-ray Scanner by Ledley in 1973. Also included is material relating to Ledley's company, Digital Science Information Corporation (DISCO), as well as the public and medical communities' reactions to the scanner.
Scope and Contents:
The Robert Ledley Papers document the development of the Automatic Computerized Transverse Axial (ACTA) X-ray Scanner, Ledley's company Digital Science Information Corporation (DISCO), as well as the public and medical communities' reactions to the scanner. The collection is arranged into nine series.

Series 1, ACTA Scanner I Schematics, 1973-1975; Series 2, ACTA Scanner I [Computer and Electronics], 1973; and Series 3, ACTA Scanner Tomograph Mechanics, 1973-1974 document the development and design of the ACTA scanner through drawings, notes, memoranda, and product information. More detailed information about these materials is located in the control file. All oversize drawings have been moved to flat storage for preservation concerns.

Series 4, ACTA Scanner Operating Instructions, 1975, is the operating manual created for the scanner used in Ledley's Georgetown lab.

Series 5, ACTA Articles, Clippings, and Press Releases, 1973-1979, is comprised of the aforementioned materials relating to the ACTA Scanner. Newspaper clippings illuminate the public's perception of the scanner, and scientific pieces highlight the medical community's reaction. Ledley's published articles on the scanner and related topics are included.

Series 6, Digital Information Science Corporation (DISCO) material, 1973-1981, documents Ledley's career and his company. A biographical sketch, list of articles, textbooks, and patents highlight Ledley's achievements. Invoices, receipts, contracts, and correspondence illuminate the financial situation at DISCO and the relationship between the company and Pfizer.

Series 7, Computer manuals, 1972-1975, documents the computer systems and software that were used with the ACTA Scanner.

Series 8, Photographic material, 1973-1978, includes an album of photographs depicting the ACTA Scanner and images of the scans it created. This album was disassembled due to preservation concerns. This series also includes a collection of slides featuring the scanner and related equipment in use and images of the scans it created. A detailed description of each photograph and slide is included in the control file.

Series 9, ACTA Scanner film, [1974?], is a 16mm narrated film describing the creation of the scanner, its components, the way they work, the scanner in use, and images of the scans produced.
Arrangement:
This collection is arranged into nine series.

Series 1, ACTA Scanner I Schematics, 1973-1975

Series 2, ACTA Scanner I [Computer and Electronics], 1973

Series 3, ACTA Scanner Tomograph Mechanics, 1973-1974

Series 4, ACTA Scanner Operating Instructions, 1975

Series 5, ACTA Articles, Clippings, and Press Releases, 1973-1979

Series 6, Digital Information Science Corporation (DISCO) material, 1973-1981, undated

Series 7, Computer manuals, 1972-1975

Series 8, Photographic material 1973-1978

Subseries 1, Photographs, 19731978

Subseries 2, Slides, 1974

Series 9, ACTA Scanner film [1974?]
Biographical / Historical:
Robert Steven Ledley was born in Flushing Meadows, New York in 1926. He received a D.D.S. degree from New York University College in 1948. While attending dental school, he simultaneously studied at Columbia University; he earned a M.A. in Theoretical Physics in 1949. He volunteered for the army and was sent to the U.S. Army Medical Field Service School in Fort Sam Houston, Texas.1 After completing his service, Ledley held a wide variety of research and academic positions in physics, electrical engineering, and medicine.

Ledley was a physicist within the External Control Group of the Electronic Computer Laboratory of the National Bureau of Standards from 1953-1954. He was an operations research analyst within the Strategic Division of the Operations Research Office at Johns Hopkins University from 1954-1956. Ledley went on to become an associate professor in the Department of Electrical Engineering at The George Washington University from 1956-1960 while also serving as a consultant mathematician at the National Bureau of Standards Data Processing Systems Division, 1957-1960. At this time, Ledley also worked part time at the National Research Council's National Academy of Sciences from 1957-1961. Ledley became the president of the National Biomedical Research Foundation in 1960, a position he still holds today. He was an instructor of pediatrics at the Johns Hopkins University School of Medicine from 1960-1963. He returned to The George Washington University's Department of Electrical Engineering in 1968 where he was a professor until 1970. He then became a professor in the Department of Physiology and Biophysics at the Georgetown University School of Medicine in 1970. In 1974, Ledley also became a professor in the Radiology Department at the Georgetown University Medical Center. In 1975, he became the director of the Medical Computing and Biophysics Division at Georgetown University Medical Center.

In 1972, the British company Electric and Musical Industries Limited (EMI) released a medical imaging machine for use on smaller areas of the body that were positioned under a water tank. In 1973, Ledley developed the Automatic Computerized Transverse Axial (ACTA) X-ray Scanner (US Patent #3,922,552). This machine was a whole-body diagnostic medical imaging system. He was awarded a grant from the National Institutes of Health for an engineering equipment project, but the money was never received due to budget cuts. Ledley looked elsewhere for funding. He consulted with Georgetown staff and discovered a neurosurgeon had asked to buy a head scanning machine from EMI. Ledley did not think the images in EMI's brochure appeared clear, and he offered to create a similar machine for half the price. Georgetown agreed to fund this project for $250,000. Ledley secured the services of a machinist at a local machine shop, an electronic engineer, and a programmer/mathematician to assist in the project.2 The ACTA Scanner debuted in February, 1974 and did not require the use of a water tank.

Following the creation of the ACTA Scanner, Ledley organized Digital Information Science Corporation (DISCO) in order to manufacture the system. DISCO began producing scanners as orders were received. Due to financial constraints, DISCO was forced to request $100,000 upon receipt of the order, $100,000 when the scanner was halfway completed, and the final $100,000 payment upon delivery3. In 1975, Pfizer purchased the rights to manufacture the ACTA Scanner from DISCO for $1.5 million.

Ledley is a Fellow of the American Association for the Advancement of Science and a senior member of the Institute of Electrical and Electronics Engineers. He has earned numerous awards and honors for his work. In 1997, he received the National Medal of Technology from President William Jefferson Clinton for his pioneering work on the whole-body CT diagnostic X-ray scanner. He also founded the Pattern Recognition Society and Computerized Tomography Society.

Sources

1 Ash, J., D. Sittig, and R. Ledley. "The Story Behind the Development of the First Whole-body Computerized Tomography Scanner as Told by Robert S. Ledley." Journal of the American Medical Informatics Association, 2006 Sep-Oct (2006), 465-469, http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=1561796. (accessed June 24, 2009).

2 Ibid.

3 Ibid.
Separated Materials:
An ACTA Scanner and numerous accessories were donated to the Division of Medicine and Science in 1984.
Provenance:
This collection was donated by Robert S. Ledley on September 18, 1984.
Restrictions:
The collection is open for research.
Rights:
Collection items available for reproduction, but the Archives Center makes no guarantees concerning intellectual property rights. Archives Center cost-recovery and use fees may apply when requesting reproductions.
Topic:
Medical innovations  Search this
Inventors  Search this
Inventions -- 20th century  Search this
Biology  Search this
History of science and technology  Search this
Digital Information Science Corporation  Search this
Diagnostic imaging  Search this
Medicine  Search this
Medical technology  Search this
Medical radiology  Search this
Whole body imaging  Search this
Tomography  Search this
Radiology  Search this
Genre/Form:
Manuals -- 1970-1990
Patents
Photographs
Design drawings
Correspondence -- 20th century
Articles -- 20th century
Diagrams
Slides (photographs) -- 1950-2000
Notes
Motion pictures (visual works) -- 20th century
Albums
Citation:
Robert Ledley Papers, 1972-1984, Archives Center, National Museum of American History, Smithsonian Institution
Identifier:
NMAH.AC.1135
See more items in:
Robert Ledley Papers
Archival Repository:
Archives Center, National Museum of American History
GUID:
https://n2t.net/ark:/65665/ep8b394c960-d574-4b92-a59f-83868a5cd581
EDAN-URL:
ead_collection:sova-nmah-ac-1135
Online Media:

ACTA Scanner I Schematics

Collection Creator:
Ledley, Robert S.  Search this
National Biomedical Research Foundation. Georgetown University  Search this
Type:
Archival materials
Date:
undated
1973-1975
Collection Restrictions:
The collection is open for research.
Collection Rights:
Collection items available for reproduction, but the Archives Center makes no guarantees concerning intellectual property rights. Archives Center cost-recovery and use fees may apply when requesting reproductions.
Collection Citation:
Robert Ledley Papers, 1972-1984, Archives Center, National Museum of American History, Smithsonian Institution
Identifier:
NMAH.AC.1135, Series 1
See more items in:
Robert Ledley Papers
Archival Repository:
Archives Center, National Museum of American History
GUID:
https://n2t.net/ark:/65665/ep85fcb10ff-a9ba-4a59-8355-d39ce8d01edc
EDAN-URL:
ead_component:sova-nmah-ac-1135-ref15

ACTA Scanner I [Computer and Electronics]

Collection Creator:
Ledley, Robert S.  Search this
National Biomedical Research Foundation. Georgetown University  Search this
Container:
Box 1, Folder 32-33
Type:
Archival materials
Date:
undated
1973
Collection Restrictions:
The collection is open for research.
Collection Rights:
Collection items available for reproduction, but the Archives Center makes no guarantees concerning intellectual property rights. Archives Center cost-recovery and use fees may apply when requesting reproductions.
Collection Citation:
Robert Ledley Papers, 1972-1984, Archives Center, National Museum of American History, Smithsonian Institution
Identifier:
NMAH.AC.1135, Series 2
See more items in:
Robert Ledley Papers
Archival Repository:
Archives Center, National Museum of American History
GUID:
https://n2t.net/ark:/65665/ep8dc898e35-cb49-4ac9-9220-604808d61793
EDAN-URL:
ead_component:sova-nmah-ac-1135-ref16

ACTA Scanner Tomograph Mechanics

Collection Creator:
Ledley, Robert S.  Search this
National Biomedical Research Foundation. Georgetown University  Search this
Container:
Box 2, Folder 1-2
Type:
Archival materials
Date:
1973-1974
undated
Collection Restrictions:
The collection is open for research.
Collection Rights:
Collection items available for reproduction, but the Archives Center makes no guarantees concerning intellectual property rights. Archives Center cost-recovery and use fees may apply when requesting reproductions.
Collection Citation:
Robert Ledley Papers, 1972-1984, Archives Center, National Museum of American History, Smithsonian Institution
Identifier:
NMAH.AC.1135, Series 3
See more items in:
Robert Ledley Papers
Archival Repository:
Archives Center, National Museum of American History
GUID:
https://n2t.net/ark:/65665/ep8af21f6b7-81de-4746-841b-6bc5e00e3cef
EDAN-URL:
ead_component:sova-nmah-ac-1135-ref17

ACTA Scanner Operating Instructions

Collection Creator:
Ledley, Robert S.  Search this
National Biomedical Research Foundation. Georgetown University  Search this
Type:
Archival materials
Date:
1975
Collection Restrictions:
The collection is open for research.
Collection Rights:
Collection items available for reproduction, but the Archives Center makes no guarantees concerning intellectual property rights. Archives Center cost-recovery and use fees may apply when requesting reproductions.
Collection Citation:
Robert Ledley Papers, 1972-1984, Archives Center, National Museum of American History, Smithsonian Institution
Identifier:
NMAH.AC.1135, Series 4
See more items in:
Robert Ledley Papers
Archival Repository:
Archives Center, National Museum of American History
GUID:
https://n2t.net/ark:/65665/ep8c73604d2-bd7c-439f-a3d4-0497d0c83639
EDAN-URL:
ead_component:sova-nmah-ac-1135-ref18

ACTA Articles, Clippings, and Press Releases

Collection Creator:
Ledley, Robert S.  Search this
National Biomedical Research Foundation. Georgetown University  Search this
Type:
Archival materials
Date:
1973-1979
Collection Restrictions:
The collection is open for research.
Collection Rights:
Collection items available for reproduction, but the Archives Center makes no guarantees concerning intellectual property rights. Archives Center cost-recovery and use fees may apply when requesting reproductions.
Collection Citation:
Robert Ledley Papers, 1972-1984, Archives Center, National Museum of American History, Smithsonian Institution
Identifier:
NMAH.AC.1135, Series 5
See more items in:
Robert Ledley Papers
Archival Repository:
Archives Center, National Museum of American History
GUID:
https://n2t.net/ark:/65665/ep81ebd35ce-1f09-4d18-bc90-962455250f00
EDAN-URL:
ead_component:sova-nmah-ac-1135-ref19

Digital Information Science Corporation (DISCO) material

Collection Creator:
Ledley, Robert S.  Search this
National Biomedical Research Foundation. Georgetown University  Search this
Container:
Box 4, Folder 9-10
Type:
Archival materials
Date:
1973-1981
undated
Collection Restrictions:
The collection is open for research.
Collection Rights:
Collection items available for reproduction, but the Archives Center makes no guarantees concerning intellectual property rights. Archives Center cost-recovery and use fees may apply when requesting reproductions.
Collection Citation:
Robert Ledley Papers, 1972-1984, Archives Center, National Museum of American History, Smithsonian Institution
Identifier:
NMAH.AC.1135, Series 6
See more items in:
Robert Ledley Papers
Archival Repository:
Archives Center, National Museum of American History
GUID:
https://n2t.net/ark:/65665/ep8246991fb-490f-4ede-b9eb-f3e4bbe78090
EDAN-URL:
ead_component:sova-nmah-ac-1135-ref20

Computer Manuals

Collection Creator:
Ledley, Robert S.  Search this
National Biomedical Research Foundation. Georgetown University  Search this
Type:
Archival materials
Date:
undated
1972-1975
Collection Restrictions:
The collection is open for research.
Collection Rights:
Collection items available for reproduction, but the Archives Center makes no guarantees concerning intellectual property rights. Archives Center cost-recovery and use fees may apply when requesting reproductions.
Collection Citation:
Robert Ledley Papers, 1972-1984, Archives Center, National Museum of American History, Smithsonian Institution
Identifier:
NMAH.AC.1135, Series 7
See more items in:
Robert Ledley Papers
Archival Repository:
Archives Center, National Museum of American History
GUID:
https://n2t.net/ark:/65665/ep8abb4a03a-d39c-47d4-9706-df5958e3b8f7
EDAN-URL:
ead_component:sova-nmah-ac-1135-ref21

Photographs

Collection Creator:
Ledley, Robert S.  Search this
National Biomedical Research Foundation. Georgetown University  Search this
Container:
Box 5
Type:
Archival materials
Date:
1973-1978
Collection Restrictions:
The collection is open for research.
Collection Rights:
Collection items available for reproduction, but the Archives Center makes no guarantees concerning intellectual property rights. Archives Center cost-recovery and use fees may apply when requesting reproductions.
Collection Citation:
Robert Ledley Papers, 1972-1984, Archives Center, National Museum of American History, Smithsonian Institution
Identifier:
NMAH.AC.1135, Subseries 8.1
See more items in:
Robert Ledley Papers
Robert Ledley Papers / Series 8: Photographic Material
Archival Repository:
Archives Center, National Museum of American History
GUID:
https://n2t.net/ark:/65665/ep827329e91-3ecc-497c-a9a6-cbf8a0b477b7
EDAN-URL:
ead_component:sova-nmah-ac-1135-ref22

Slides

Collection Creator:
Ledley, Robert S.  Search this
National Biomedical Research Foundation. Georgetown University  Search this
Container:
Box 6
Type:
Archival materials
Date:
1974
Collection Restrictions:
The collection is open for research.
Collection Rights:
Collection items available for reproduction, but the Archives Center makes no guarantees concerning intellectual property rights. Archives Center cost-recovery and use fees may apply when requesting reproductions.
Collection Citation:
Robert Ledley Papers, 1972-1984, Archives Center, National Museum of American History, Smithsonian Institution
Identifier:
NMAH.AC.1135, Subseries 8.2
See more items in:
Robert Ledley Papers
Robert Ledley Papers / Series 8: Photographic Material
Archival Repository:
Archives Center, National Museum of American History
GUID:
https://n2t.net/ark:/65665/ep81b59acc9-ce9b-4cb2-8f0e-47b50fa3eb10
EDAN-URL:
ead_component:sova-nmah-ac-1135-ref23

ACTA Scanner Film

Collection Creator:
Ledley, Robert S.  Search this
National Biomedical Research Foundation. Georgetown University  Search this
Type:
Archival materials
Date:
1974?
Separated Materials:
Oversize folders 1-2 are separated for preservation concerns
Collection Restrictions:
The collection is open for research.
Collection Rights:
Collection items available for reproduction, but the Archives Center makes no guarantees concerning intellectual property rights. Archives Center cost-recovery and use fees may apply when requesting reproductions.
Collection Citation:
Robert Ledley Papers, 1972-1984, Archives Center, National Museum of American History, Smithsonian Institution
Identifier:
NMAH.AC.1135, Series 9
See more items in:
Robert Ledley Papers
Archival Repository:
Archives Center, National Museum of American History
GUID:
https://n2t.net/ark:/65665/ep8c5e8d6df-8e68-4f96-a80a-dcaf305e92e0
EDAN-URL:
ead_component:sova-nmah-ac-1135-ref24

Video Amp Design (ACTAT) A1

Collection Creator:
Ledley, Robert S.  Search this
National Biomedical Research Foundation. Georgetown University  Search this
Container:
Box 1, Folder 1
Type:
Archival materials
Date:
undated
1973-1974
Collection Restrictions:
The collection is open for research.
Collection Rights:
Collection items available for reproduction, but the Archives Center makes no guarantees concerning intellectual property rights. Archives Center cost-recovery and use fees may apply when requesting reproductions.
Collection Citation:
Robert Ledley Papers, 1972-1984, Archives Center, National Museum of American History, Smithsonian Institution
See more items in:
Robert Ledley Papers
Robert Ledley Papers / Series 1: ACTA Scanner I Schematics
Archival Repository:
Archives Center, National Museum of American History
GUID:
https://n2t.net/ark:/65665/ep82c6ae868-4e86-481c-8402-d1b83c1c6a9c
EDAN-URL:
ead_component:sova-nmah-ac-1135-ref25

Video Amp #2 A2

Collection Creator:
Ledley, Robert S.  Search this
National Biomedical Research Foundation. Georgetown University  Search this
Container:
Box 1, Folder 2
Type:
Archival materials
Date:
1974
undated
Collection Restrictions:
The collection is open for research.
Collection Rights:
Collection items available for reproduction, but the Archives Center makes no guarantees concerning intellectual property rights. Archives Center cost-recovery and use fees may apply when requesting reproductions.
Collection Citation:
Robert Ledley Papers, 1972-1984, Archives Center, National Museum of American History, Smithsonian Institution
See more items in:
Robert Ledley Papers
Robert Ledley Papers / Series 1: ACTA Scanner I Schematics
Archival Repository:
Archives Center, National Museum of American History
GUID:
https://n2t.net/ark:/65665/ep884b1a5df-f92c-4c4d-8d45-9aeba2f6315a
EDAN-URL:
ead_component:sova-nmah-ac-1135-ref26

Analog Signal Generator A8

Collection Creator:
Ledley, Robert S.  Search this
National Biomedical Research Foundation. Georgetown University  Search this
Container:
Box 1, Folder 3
Type:
Archival materials
Date:
1973
undated
Collection Restrictions:
The collection is open for research.
Collection Rights:
Collection items available for reproduction, but the Archives Center makes no guarantees concerning intellectual property rights. Archives Center cost-recovery and use fees may apply when requesting reproductions.
Collection Citation:
Robert Ledley Papers, 1972-1984, Archives Center, National Museum of American History, Smithsonian Institution
See more items in:
Robert Ledley Papers
Robert Ledley Papers / Series 1: ACTA Scanner I Schematics
Archival Repository:
Archives Center, National Museum of American History
GUID:
https://n2t.net/ark:/65665/ep8b4a489ad-a5fa-46e2-a633-1e7447291c1a
EDAN-URL:
ead_component:sova-nmah-ac-1135-ref27

A/D Convertor #1 Card A3

Collection Creator:
Ledley, Robert S.  Search this
National Biomedical Research Foundation. Georgetown University  Search this
Container:
Box 1, Folder 4
Type:
Archival materials
Date:
undated
1973-1974
Collection Restrictions:
The collection is open for research.
Collection Rights:
Collection items available for reproduction, but the Archives Center makes no guarantees concerning intellectual property rights. Archives Center cost-recovery and use fees may apply when requesting reproductions.
Collection Citation:
Robert Ledley Papers, 1972-1984, Archives Center, National Museum of American History, Smithsonian Institution
See more items in:
Robert Ledley Papers
Robert Ledley Papers / Series 1: ACTA Scanner I Schematics
Archival Repository:
Archives Center, National Museum of American History
GUID:
https://n2t.net/ark:/65665/ep8cfd1262a-528a-4648-82e7-3e7261887f67
EDAN-URL:
ead_component:sova-nmah-ac-1135-ref28

A/D Convertor #2 A4

Collection Creator:
Ledley, Robert S.  Search this
National Biomedical Research Foundation. Georgetown University  Search this
Container:
Box 1, Folder 5
Type:
Archival materials
Date:
1973-1974
undated
Collection Restrictions:
The collection is open for research.
Collection Rights:
Collection items available for reproduction, but the Archives Center makes no guarantees concerning intellectual property rights. Archives Center cost-recovery and use fees may apply when requesting reproductions.
Collection Citation:
Robert Ledley Papers, 1972-1984, Archives Center, National Museum of American History, Smithsonian Institution
See more items in:
Robert Ledley Papers
Robert Ledley Papers / Series 1: ACTA Scanner I Schematics
Archival Repository:
Archives Center, National Museum of American History
GUID:
https://n2t.net/ark:/65665/ep8058e45b2-36be-4d45-bd05-3a34ecd2aa30
EDAN-URL:
ead_component:sova-nmah-ac-1135-ref29

Miscellaneous Analog (A & B) A9

Collection Creator:
Ledley, Robert S.  Search this
National Biomedical Research Foundation. Georgetown University  Search this
Container:
Box 1, Folder 6
Type:
Archival materials
Date:
undated
1973
Collection Restrictions:
The collection is open for research.
Collection Rights:
Collection items available for reproduction, but the Archives Center makes no guarantees concerning intellectual property rights. Archives Center cost-recovery and use fees may apply when requesting reproductions.
Collection Citation:
Robert Ledley Papers, 1972-1984, Archives Center, National Museum of American History, Smithsonian Institution
See more items in:
Robert Ledley Papers
Robert Ledley Papers / Series 1: ACTA Scanner I Schematics
Archival Repository:
Archives Center, National Museum of American History
GUID:
https://n2t.net/ark:/65665/ep84e7c1419-78b2-4e6b-a908-e9b756273bef
EDAN-URL:
ead_component:sova-nmah-ac-1135-ref30

Translate Accel Pulses A10

Collection Creator:
Ledley, Robert S.  Search this
National Biomedical Research Foundation. Georgetown University  Search this
Container:
Box 1, Folder 7
Type:
Archival materials
Date:
1973-1975
undated
Collection Restrictions:
The collection is open for research.
Collection Rights:
Collection items available for reproduction, but the Archives Center makes no guarantees concerning intellectual property rights. Archives Center cost-recovery and use fees may apply when requesting reproductions.
Collection Citation:
Robert Ledley Papers, 1972-1984, Archives Center, National Museum of American History, Smithsonian Institution
See more items in:
Robert Ledley Papers
Robert Ledley Papers / Series 1: ACTA Scanner I Schematics
Archival Repository:
Archives Center, National Museum of American History
GUID:
https://n2t.net/ark:/65665/ep85111bc7a-c612-41bd-bb18-73ea0b6b959f
EDAN-URL:
ead_component:sova-nmah-ac-1135-ref31

Miscellaneous AN-2 A11

Collection Creator:
Ledley, Robert S.  Search this
National Biomedical Research Foundation. Georgetown University  Search this
Container:
Box 1, Folder 8
Type:
Archival materials
Date:
undated
Collection Restrictions:
The collection is open for research.
Collection Rights:
Collection items available for reproduction, but the Archives Center makes no guarantees concerning intellectual property rights. Archives Center cost-recovery and use fees may apply when requesting reproductions.
Collection Citation:
Robert Ledley Papers, 1972-1984, Archives Center, National Museum of American History, Smithsonian Institution
See more items in:
Robert Ledley Papers
Robert Ledley Papers / Series 1: ACTA Scanner I Schematics
Archival Repository:
Archives Center, National Museum of American History
GUID:
https://n2t.net/ark:/65665/ep879cb14b6-1e91-4888-b948-0b05eaf25cd7
EDAN-URL:
ead_component:sova-nmah-ac-1135-ref32

Shutter & [Lights] L2

Collection Creator:
Ledley, Robert S.  Search this
National Biomedical Research Foundation. Georgetown University  Search this
Container:
Box 1, Folder 9
Type:
Archival materials
Date:
1973-1974
undated
Collection Restrictions:
The collection is open for research.
Collection Rights:
Collection items available for reproduction, but the Archives Center makes no guarantees concerning intellectual property rights. Archives Center cost-recovery and use fees may apply when requesting reproductions.
Collection Citation:
Robert Ledley Papers, 1972-1984, Archives Center, National Museum of American History, Smithsonian Institution
See more items in:
Robert Ledley Papers
Robert Ledley Papers / Series 1: ACTA Scanner I Schematics
Archival Repository:
Archives Center, National Museum of American History
GUID:
https://n2t.net/ark:/65665/ep81649511f-5ad6-4b53-b6a9-f2c855854527
EDAN-URL:
ead_component:sova-nmah-ac-1135-ref33

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