Title:
Tabulating constructions
United States Patent 2953300
US Patent References:
/RE23385.html
- - RE23385
Statistical card
- - 2084848
Control element for statistical machines
- - 2268499
Record card
- - 2431017
/2704634.html
- - 2704634
/RE23385.html
- - RE23385
Statistical card
- - 2084848
Control element for statistical machines
- - 2268499
Record card
- - 2431017
/2704634.html
- - 2704634
Inventors:
O'brian, Edward D.
O'brian, Robert E.
O'brian, Robert E.
Publication Date:
09/20/1960
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Export Citation:
Assignee:
O'brian, Edward D.
O'brian, Robert E.
O'brian, Robert E.
Primary Class:
Other Classes:
235/493, 235/489
International Classes:
G06K19/08