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United States Patent 1847800
Inventors:
Maximilian, Weil
Publication Date:
03/01/1932
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Download PDF 1847800
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Assignee:
Maximilian, Weil
Primary Class:
368/228
Other Classes:
968/143, 968/161
International Classes:
G04B19/04
;
G04B19/18
;
G04B19/00
;
G04B19/06