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Light-controlled signaling system
US 2,131,328 A
Filed
: 04/15/1935
Issued
: 09/27/1938
Est. Priority Date
: 04/14/1934
Status: Expired due to Term
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Current Assignee
Fritz Michelssen
Original Assignee
Fritz Michelssen
Inventors
FRITZ MICHELSSEN
Application Number
US02/016,515
Time in Patent Office
1,261 Days
Field of Search
US Class Current
250/338.1
CPC Class Codes
H04B 10/00
Transmission systems employ...
Y10S 246/01
Radiant energy devices
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