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Signalling system
US 2,881,409 A
Filed
: 09/07/1955
Issued
: 04/07/1959
Est. Priority Date
: 09/07/1955
Status: Expired due to Term
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34
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Current Assignee
Howard S. Knaack
,
Lee Cook Vernon
Original Assignee
Howard S. Knaack
,
Lee Cook Vernon
Inventors
LEE COOK VERNON
,
Knaack, Howard S.
Application Number
US03/532,845
Time in Patent Office
1,308 Days
Field of Search
US Class Current
340/906
CPC Class Codes
G08G 1/087
Override of traffic control...
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