Description of two-cell photoelectric, bidirectional, electronic timer; built-in electric counter tallies traffic automatically and traffic speeds are read and recorded manually; details of complete assembly.
Electronic roadside speed timer developed by division of highways
Calif Highways Pub Works
California Highways and Public Works ; 20 , n 5
1942
Illustration p 7
Article (Journal)
English
© Metadata Copyright Elsevier B. V. All rights reserved.
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