Title:
Grooving of index cards
Document Type and Number:
United States Patent 2581049

Inventors:
William, Schempers
Publication Date:
01/01/1952
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Referenced by:
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Assignee:
John, Hancock Mutual Life Insur
Primary Class:
409/228
Other Classes:
83/417, 83/409, 144/204.200, 144/136.100, 83/917, 83/875, 144/278.100
International Classes:
B26D3/14; B26D3/00
US Patent References:
0228750
0234399
0254883
1280202
1280218
1280275
1289431
1289432
Foreign References:
GB339724A




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