Road hazard warning sign

Details Road hazard warning sign Road hazard warning sign

1987-02-05

1989-12-26

Burke, Wallace R.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Visual

Patent

active

D03052133

REFERENCES:
patent: D220013 (1971-02-01), Kaltman
patent: 2002248 (1934-12-01), Muehleisen
patent: 3946699 (1976-03-01), Mirshak

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