Caution signal for hazardous situation

Details Caution signal for hazardous situation Caution signal for hazardous situation

1988-10-07

1991-03-19

Burke, Wallace R.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Visual

D20 33

Patent

active

D03155285

REFERENCES:
patent: D33839 (1901-01-01), Emerson
patent: D47781 (1915-09-01), Carson
patent: D214855 (1969-08-01), Rigsby
patent: D234583 (1975-03-01), Chrlich
patent: D253793 (1979-12-01), Peterson
patent: D280743 (1985-09-01), Pregon
patent: D310109 (1990-08-01), Vega
patent: 4455963 (1984-06-01), Matsuo

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