Measuring – testing – or signalling instruments – Security or signal instrument or casing – Aural – i.e. – audible
Patent
1976-12-28
1978-12-26
Lucas, Susan J.
Measuring, testing, or signalling instruments
Security or signal instrument or casing
Aural, i.e., audible
D1006
Patent
active
D02506386
REFERENCES:
patent: D69123 (1925-12-01), Frerichs
Nutone Products Guide, p. 5, Door Chime LA-13.
General Electric Company
Lucas Susan J.
Rochford Paul E.
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