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United States Patent 1497825
Inventors:
Hjalmar, Zahl
Publication Date:
06/17/1924
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Download PDF 1497825
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Assignee:
Hjalmar, Zahl
Primary Class:
362/127
Other Classes:
312/125, 362/235, 312/305
International Classes:
A47F5/025
;
A47F5/02