Title:
Means for preventing fraudulent alteration of documents
Document Type and Number:
United States Patent 2285806
Inventors:
Close, Wilmot S.
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Publication Date:
06/09/1942
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Assignee:
Close, Wilmot S.
Primary Class:
Other Classes:
283/100, 283/59, 428/916, 283/58
International Classes:
B41M3/14; B42D15/00