3M (Minnesota Mining and Manufacturing) Company was founded in 1902. Its early aim was to mine minerals for the abrasive industry. The company was relocated to St. Paul, Minnesota in 1910, and expanded its products, developing pressure sensitive adhesive tapes in the 1920s, and later manufactured recording tape, reflective materials, offset printing plates, videotape, microfilm, and numerous other products.
A collection of the company's monthly employee newsletter, Megaphone.
3M Megaphone Collection, 1941-1977, Archives Center, National Museum of American History