Hand operated calculating device
United States Patent 3022942
US Patent References:
/0335374.html
- - 0335374
/1009886.html
- - 1009886
Registering, display, and transmission apparatus and system
- - 1939822
/2513532.html
- - 2513532
Hand-operated counter or tally
- - 2572784
/0335374.html
- - 0335374
/1009886.html
- - 1009886
Registering, display, and transmission apparatus and system
- - 1939822
/2513532.html
- - 2513532
Hand-operated counter or tally
- - 2572784
Inventors:
Veen, Anton Van
Publication Date:
02/27/1962
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Export Citation:
Assignee:
Veen, Anton Van
Primary Class:
Other Classes:
235/135, 235/79, 235/117A, 235/117R, D18/6
International Classes:
G06M1/14; G06M3/14; G06M1/00; G06M3/00
US Patent References:
| 2818214 | Hand counter |
Foreign References:
| GB680580A |