Emergency vehicle proximity warning signal

Details Emergency vehicle proximity warning signal Emergency vehicle proximity warning signal

1993-02-01

1994-03-15

Burke, Wallace R.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Alarm or control thereof

Patent

active

D03451160

REFERENCES:
patent: 3233217 (1966-02-01), Bost, Jr.
patent: 3735342 (1973-05-01), Helliker et al.
patent: 3760349 (1973-09-01), Keister
patent: 3854119 (1974-12-01), Friedman et al.
patent: 3997868 (1976-12-01), Ribnick et al.
patent: 4238778 (1980-12-01), Ohsumi
patent: 4794394 (1988-12-01), Halstead
patent: 4952931 (1990-08-01), Serageldin et al.

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