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Four-indication signal control system embodying polar biased code following and polarized line relays
US 2,638,536 A
Filed
: 04/05/1947
Issued
: 05/12/1953
Est. Priority Date
: 04/05/1947
Status: Expired due to Term
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Current Assignee
Thomas W. Tizzard Jr
Original Assignee
Thomas W. Tizzard Jr
Inventors
Tizzard, Thomas W. Jr.
Application Number
US02/739,694
Time in Patent Office
2,229 Days
Field of Search
US Class Current
246/46
CPC Class Codes
B61L 1/185
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