Portable visual and electric traffic signal
United States Patent 2564170

Inventors:
Nusbaum, Maynard H.
Beall, Donald L.
Publication Date:
08/14/1951
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Assignee:
Nusbaum
Primary Class:
340/908
Other Classes:
362/486, D10/114, 248/130, 40/590, 362/540
International Classes:
B62D63/06; E01F9/012; B62D63/00; E01F9/011