Megaphone for sporting events

Details Megaphone for sporting events Megaphone for sporting events

1996-04-01

1998-02-17

Jackson, Marcus A.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Aural, i.e., audible

1005

Patent

active

D03907988

REFERENCES:
patent: D247785 (1978-04-01), Ehrich
patent: D293216 (1987-12-01), Fernandez
patent: D312056 (1990-11-01), Ady
patent: 1150447 (1915-08-01), Mayland
patent: 3419996 (1969-01-01), Johnson, Jr.

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