Electromagnetic bell

Details Electromagnetic bell Electromagnetic bell

1986-12-11

1989-10-24

Lucas, Susan J.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Aural, i.e., audible

Patent

active

D03041638

REFERENCES:
patent: D149907 (1948-06-01), Rifkin
patent: 2189181 (1940-02-01), Rittenhouse
patent: 2290717 (1942-07-01), Swanson
patent: 4300128 (1981-11-01), Ishii

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