Whistle

Details Whistle Whistle

1998-07-21

1999-05-18

Jackson, Marcus A.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Aural, i.e., audible

1005

Patent

active

D04099397

REFERENCES:
patent: D102543 (1936-12-01), Butterfield
patent: D199878 (1964-12-01), Mulligan
patent: D228933 (1973-10-01), Forrest
patent: D266407 (1982-10-01), Nagel
patent: D266492 (1982-10-01), Oppermann, Sr. et al.
patent: D279461 (1985-07-01), Zafreniere et al.
patent: D291421 (1987-08-01), Zance
patent: 4821670 (1989-04-01), Foxcroft et al.
patent: 5086726 (1992-02-01), Sharp

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