Road marker

Details Road marker Road marker

1988-04-25

1990-09-11

Gandy, James M.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Visual

Patent

active

D03104974

REFERENCES:
patent: 2719505 (1955-10-01), Blumenthal
patent: 3499413 (1970-03-01), Heard
patent: 3618556 (1971-11-01), Dittrich
patent: 3660817 (1972-05-01), Abrams
patent: 3809007 (1974-05-01), Brown

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