Combined transmitter and receiver for a door chime

Details Combined transmitter and receiver for a door chime Combined transmitter and receiver for a door chime

1992-04-29

1994-02-08

Burke, Wallace R.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Aural, i.e., audible

Patent

active

D03440362

REFERENCES:
patent: D201593 (1965-07-01), Stevenson
patent: D275088 (1984-08-01), Kachi et al.
patent: D281865 (1985-12-01), Abel
patent: D294471 (1988-03-01), Levin et al.
patent: 4837559 (1989-06-01), Green, Sr.

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