Universal whistle tip

Details Universal whistle tip Universal whistle tip

1997-06-26

1999-10-19

Jackson, Marcus A.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Aural, i.e., audible

1005

Patent

active

D04154452

REFERENCES:
patent: D76516 (1928-10-01), Zisch
patent: D102543 (1936-12-01), Butterfield
patent: D266407 (1982-10-01), Nagel
patent: D266652 (1982-10-01), Nagel
patent: D313364 (1991-01-01), Synnergren
patent: 1748460 (1930-02-01), Petrie
patent: 2915851 (1959-12-01), Ringman

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