Emergency warning signal

Details Emergency warning signal Emergency warning signal

1990-11-19

1992-12-29

Burke, Wallace R.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Visual

Patent

active

D03320677

REFERENCES:
patent: D196158 (1963-08-01), Romano
patent: D215372 (1969-09-01), Kahn
patent: D240514 (1976-07-01), Brudy
patent: 3934541 (1976-01-01), May et al.

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