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PHOTOELECTRIC CELL INSTALLATION FOR SIGNAL SYSTEM AND METHOD OF INSTALLING SAME
US 3,483,507 A
Filed
: 09/21/1965
Issued
: 12/09/1969
Est. Priority Date
: 09/21/1965
Status: Expired due to Term
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Current Assignee
Edward A. Griswold
Original Assignee
Edward A. Griswold
Inventors
Griswold, Edward A.
Application Number
US04/488,946
Time in Patent Office
1,540 Days
Field of Search
US Class Current
340/942
CPC Class Codes
G08G 1/04
using optical or ultrasonic...
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