Combined road marker and lock-in sign

Details Combined road marker and lock-in sign Combined road marker and lock-in sign

1983-03-14

1985-02-26

Bullock, B. J.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Visual

Patent

active

D02777380

REFERENCES:
patent: D60293 (1922-01-01), Meden
patent: D235744 (1975-07-01), England
patent: D272809 (1984-02-01), Bent et al.
patent: 1058881 (1967-02-01), Semco
patent: 2957444 (1960-10-01), Boettler
patent: 3099244 (1963-07-01), Knapp
patent: 3520235 (1970-07-01), Palazzolo et al.
patent: 3809007 (1974-05-01), Brown
patent: 4197808 (1980-04-01), Kinninger
patent: 4329800 (1982-05-01), Shuman

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