Title
Early Calculating Devices - Patent Application for a Caluclating MachineCatalog Number
102704297Type
Still ImageDescription
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.Dimensions
overall: 4 in x 5 inCategory
Identification photographCredit
Courtesy of Gwen BellLot Number
X7413.2015