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United States Patent 1894028
Inventors:
Abraham, Deutschmeister
Publication Date:
01/10/1933
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Download PDF 1894028
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Assignee:
Abraham, Deutschmeister
Primary Class:
229/68.100
Other Classes:
229/92.700, 229/92, 229/75
International Classes:
G09F23/10
;
G09F23/00