Title:
Record card with printed index points
United States Patent 1853443

Inventors:
Michael, Maul
Publication Date:
04/12/1932
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Assignee:
TABULATING MACHINE CO
Primary Class:
235/494
Other Classes:
235/492, 178/17D, 382/182, 235/454, 101/399, 101/93, 250/557, 235/439
International Classes:
G06K9/18