Helmet bell

Details Helmet bell Helmet bell

1998-08-21

1999-04-20

Jackson, Marcus A.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Aural, i.e., audible

1005

Patent

active

D04083130

REFERENCES:
patent: D224853 (1972-09-01), Merjer
patent: D272810 (1984-02-01), Stilson
patent: D346986 (1994-05-01), Friess, Jr.
patent: D369985 (1996-05-01), Kehler
patent: D389422 (1998-01-01), Zin
patent: 864461 (1907-08-01), Gibbs
patent: 4619846 (1986-10-01), Qborzil et al.

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