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Discriminating acoustic signal detector
US 2,545,218 A
Filed
: 09/16/1947
Issued
: 03/13/1951
Est. Priority Date
: 09/16/1947
Status: Expired due to Term
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Current Assignee
Frank P. Weber
,
Martin J. Carmody
Original Assignee
Frank P. Weber
,
Martin J. Carmody
Inventors
Weber, Frank P.
,
Carmody, Martin J.
Application Number
US02/774,252
Time in Patent Office
1,274 Days
Field of Search
US Class Current
340/902
CPC Class Codes
G08B 1/08
using electric transmission...
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