Card sorting device
United States Patent 2683458
US Patent References:
/0999991.html
- - 0999991

Recording and detecting system
- - 1585867

Apparatus for sorting cards
- - 2284808


Inventors:
Davis, Martha E.
Jacobsen, Jacob C.
Publication Date:
07/13/1954
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Assignee:
Agriculture US.
Primary Class:
209/612
International Classes:
G06K21/04; G06K21/00
Foreign References:
FR854191A
FR915894A