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US 2,971,806 A
Filed
: 07/18/1957
Issued
: 02/14/1961
Est. Priority Date
: 07/18/1957
Status: Expired due to Term
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Current Assignee
Norman H. Andreasen
Original Assignee
Norman H. Andreasen
Inventors
Andreasen, Norman H.
Application Number
US03/672,818
Time in Patent Office
1,307 Days
Field of Search
US Class Current
312/223.1
CPC Class Codes
G08B 3/1008
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