Title:
Audio road signal
United States Patent 2774323
Inventors:
Kirk, Everett S.
Publication Date:
12/18/1956
Export Citation:
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Assignee:
Kirk, Everett S.
Primary Class:
116/63P
Other Classes:
116/63R, 404/10
International Classes:
E01F9/04; E01F9/04
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US Patent References:
2121961Traffic marking device
1833124Traffic sign
1518616Highway safety device