Early Calculating Devices - Patent Application for a Caluclating Machine
Catalog Number
102704297
Type
Still Image
Description
B&W image of Sheet 1 of 7 sheets of a Patent Application for a Calculating Machine by C. Hamann. 1,011,617 Application Filed June 29,1910 Patented Dec. 12, 1911 It has three diagrams of the machine construction.