Whistle

Details Whistle Whistle

1989-02-09

1991-01-22

Burke, Wallace R.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Aural, i.e., audible

Patent

active

D03139514

REFERENCES:
patent: D18003 (1888-01-01), Osborn
patent: D293657 (1988-01-01), Peterson
patent: 2245484 (1941-06-01), Neavens
patent: 2825180 (1958-03-01), Dieckmann
patent: 4811666 (1989-03-01), Nutly

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