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United States Patent 2815595
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Inventors:
Davis, Kenneth M.
Publication Date:
12/10/1957
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Assignee:
Davis, Kenneth M.
Primary Class:
40/641
Other Classes:
24/DIG.011, 24/67AR, 40/360, 40/342
International Classes:
B42F19/00; G09F3/10; G09F3/02
US Patent References:
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