Audio road signal
United States Patent 2774323
US Patent References:
Highway safety device
- - 1518616

Traffic sign
- - 1833124

Traffic marking device
- - 2121961


Inventors:
Kirk, Everett S.
Publication Date:
12/18/1956
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Assignee:
Kirk, Everett S.
Primary Class:
116/63P
Other Classes:
116/63R, 404/10
International Classes:
E01F9/04