Push button for wireless door chime

Measuring – testing – or signalling instruments – Security or signal instrument or casing – Aural – i.e. – audible

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1005

Patent

active

D03915140

REFERENCES:
patent: D114965 (1939-05-01), Rittenhouse
patent: D172021 (1954-04-01), Grohsgal
patent: D199446 (1964-10-01), Stevenson
patent: D350302 (1994-09-01), Dawson
patent: D380167 (1997-06-01), Ryan

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