Statistical cards and means for and method of preparing them
United States Patent 2307617

Inventors:
Braun, Karl J.
Publication Date:
01/05/1943
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Assignee:
REMINGTON RAND INC
Primary Class:
83/33
Other Classes:
30/1, 30/363, 235/489
International Classes:
B26F1/36; B26F1/32