U.S. Patent #2,277,840 – Contact System – File 2, 1939-1942, undated
File — Box: 5, Folder: 15
Dates
- Creation: 1939-1942, undated
Repository Details
Part of the Science History Institute Archives Repository
Contact:
315 Chestnut Street
Philadelphia PA 19106 United States
215.873.8265
215.873.5265 (Fax)
reference@sciencehistory.org
315 Chestnut Street
Philadelphia PA 19106 United States
215.873.8265
215.873.5265 (Fax)
reference@sciencehistory.org