Title:
Tabulating constructions
United States Patent 2953300
Inventors:
O'brian, Edward D.
O'brian, Robert E.
Publication Date:
09/20/1960
Export Citation:
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Assignee:
O'brian, Edward D.
O'brian, Robert E.
Primary Class:
235/487
Other Classes:
235/489, 235/493
International Classes:
G06K19/08; G06K19/08
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US Patent References:
2704634N/A
2431017Record card
2268499Control element for statistical machines
2084848Statistical card
RE23385N/A