Electromagnetic sound generator

Details Electromagnetic sound generator Electromagnetic sound generator

1998-10-19

1999-08-31

Jackson, Marcus A.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Aural, i.e., audible

1005

Patent

active

D04132785

REFERENCES:
patent: D378746 (1997-04-01), Imahori
patent: D389421 (1998-01-01), Fushimi et al.
patent: D389765 (1998-01-01), Imahori
patent: D401525 (1998-11-01), Sone et al.
patent: D401589 (1998-11-01), Sone
patent: D401590 (1998-11-01), Tajima
patent: D401881 (1998-12-01), Sone et al.

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