Whistle

Details Whistle Whistle

1994-02-14

1994-09-27

Burke, Wallace R.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Aural, i.e., audible

Patent

active

D03509087

REFERENCES:
patent: D76516 (1928-10-01), Zisch
patent: D96272 (1935-07-01), Neill
patent: D102543 (1936-12-01), Butterfield
patent: D266407 (1982-10-01), Nagel
patent: D292779 (1982-11-01), Bayly
patent: D334598 (1993-04-01), Burgess
patent: 1748460 (1930-02-01), Petrie
patent: 1867903 (1932-07-01), Wilcox
patent: 4821670 (1989-04-01), Foxcroft
patent: 5086726 (1992-02-01), Sharp

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