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US 2,815,640 A
Filed
: 10/20/1955
Issued
: 12/10/1957
Est. Priority Date
: 10/20/1955
Status: Expired due to Term
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Current Assignee
Jack Kirshner
Original Assignee
Jack Kirshner
Inventors
Kirshner, Jack
Application Number
US03/541,795
Time in Patent Office
782 Days
Field of Search
US Class Current
368/285
CPC Class Codes
G04B 47/046
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