Whistle

Details Whistle Whistle

1988-09-12

1990-11-06

Burke, Wallace R.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Aural, i.e., audible

Patent

active

D03118789

REFERENCES:
patent: D59816 (1921-11-01), Clarke
patent: 1720813 (1929-07-01), Agnew et al.
patent: 4218845 (1980-08-01), Evans et al.
patent: 4614503 (1986-09-01), Skoda

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