Whistle

Details Whistle Whistle

1987-01-20

1989-07-25

Lucas, Susan J.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Aural, i.e., audible

Patent

active

D03023982

REFERENCES:
patent: D240405 (1976-07-01), Erhart
patent: D292779 (1987-11-01), Bayly
patent: 2229322 (1941-01-01), Berlin

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