Title:
Electric control system for tabulating cards, documents, and the like
United States Patent 2224646
Inventors:
Friedman, William F.
Whitman, Vernon E.
Publication Date:
12/10/1940
Export Citation:
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Assignee:
Friedman, William F.
Whitman, Vernon E.
Primary Class:
209/583
Other Classes:
209/657, 234/75, 235/454, 235/462.25, 235/492, 235/494, 250/555, 340/5.1
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