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United States Patent 2331639
Inventors:
Goran, Tigerstedt Tor
Publication Date:
10/12/1943
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Download PDF 2331639
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Assignee:
Esco, Skandinaviska Companiet F.
Primary Class:
200/37R
Other Classes:
968/616
International Classes:
G04C23/22
;
G04C23/00