A few nice file patent images I found:
Will Korn Patent Filed November 12, 1929
Image by Ryan Somma
Taken at the National Cryptologic Museum, NSA.
Creative Commons photo courtesy of ideonexus, please feel free to use for your own purposes.
Arthur Scherbius Patent Filed February 6, 1923
Image by Ryan Somma
Taken at the National Cryptologic Museum, NSA.
Creative Commons photo courtesy of ideonexus, please feel free to use for your own purposes.
Hugo Koch Patent Filed September 18, 1920
Image by Ryan Somma
Taken at the National Cryptologic Museum, NSA.
Creative Commons photo courtesy of ideonexus, please feel free to use for your own purposes.
