Mark sensing template for electrical accounting machines
United States Patent 2525837
US Patent References:
/1132261.html
- - 1132261

/1234956.html
- - 1234956

Test device
- - 1928565

Drawing appliance stencil
- - 1974442


Inventors:
Simplair, John I.
Publication Date:
10/17/1950
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Assignee:
Simplair, John I.
Primary Class:
33/563
Other Classes:
434/364, 273/148R, 235/495
International Classes:
G06K19/00