Sound module

Details Sound module Sound module

1998-02-04

1999-01-19

Jackson, Marcus A.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Aural, i.e., audible

1005

Patent

active

D04043278

REFERENCES:
patent: D181376 (1957-11-01), Smith
patent: D236817 (1975-09-01), Sweany
patent: D254730 (1980-04-01), Mitumori
patent: D259864 (1981-07-01), Snyder
patent: D272993 (1984-03-01), Chan
patent: 2554627 (1951-05-01), Merola

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