Elisha Perkins (1741-1799) was an American physician who, in 1796, obtained a patent for metal “tractors” that promised to cure such ailments as inflammation and rheumatism.
Ref: Jacques M. Quen, “Elisha Perkins, Physician, Nostrum-Vendor, or Charlatan?” <i>Bulletin of the History of Medicine</i> 37 (1963): 159-166.