Door chime transmitter

Details Door chime transmitter Door chime transmitter

1997-07-09

1998-03-24

Jackson, Marcus A.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Aural, i.e., audible

1005

Patent

active

D03925765

REFERENCES:
patent: D199941 (1964-12-01), Stevenson
patent: D201593 (1965-07-01), Stevenson
patent: D207755 (1967-05-01), Stevenson
patent: D258424 (1981-03-01), Doggart
patent: D264196 (1982-05-01), Doggart
patent: D275088 (1984-08-01), Kachi et al.
patent: D380167 (1997-06-01), Ryan
patent: D382502 (1997-08-01), Ryan

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