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United States Patent 2328806

Inventors:
Hoofer, Charles F.
Publication Date:
09/07/1943
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Assignee:
Hoofer, Charles F.
Primary Class:
40/311
Other Classes:
24/336, 40/652, 40/666, 40/669, 40/658
International Classes:
G09F3/18; G09F3/08