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Stop request system for public conveyances
US 2,302,872 A
Filed
: 06/22/1940
Issued
: 11/24/1942
Est. Priority Date
: 06/22/1940
Status: Expired due to Term
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Current Assignee
Wiley A. Landrum
Original Assignee
Wiley A. Landrum
Inventors
Landrum, Wiley A.
Application Number
US02/341,949
Time in Patent Office
885 Days
Field of Search
US Class Current
340/433
CPC Class Codes
G08B 5/36
using visible light sources
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