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United States Patent 2315158

Inventors:
Markham, Edwin A.
Publication Date:
03/30/1943
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Assignee:
Markham, Edwin A.
Primary Class:
312/100
Other Classes:
232/17, 312/229, 52/102, 52/38, 70/456R, 70/63, 40/612
International Classes:
G09F3/18; G09F3/08