Whistle

Details Whistle Whistle

1990-04-20

1991-06-04

Burke, Wallace R.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Aural, i.e., audible

Patent

active

D03172732

REFERENCES:
patent: D48181 (1915-11-01), Holstein
patent: D158172 (1950-04-01), Berk
patent: D159283 (1950-07-01), Sivitz
patent: 321202 (1885-06-01), Fisher
patent: D500433 (1893-06-01), Schubert

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