Measuring – testing – or signalling instruments – Security or signal instrument or casing – Aural – i.e. – audible
Patent
1981-10-16
1984-08-07
Kemper, Catherine E.
Measuring, testing, or signalling instruments
Security or signal instrument or casing
Aural, i.e., audible
Patent
active
D02749920
REFERENCES:
patent: D250638 (1978-12-01), Donnelly
Nutone, 12/1979, p. 3; Door Chime in middle of page, 2nd from right-#lb-55 Melody (dark oak).
Gitlin Suzanne N.
Guttman Richard T.
Kemper Catherine E.
Litchfield Stephen A.
Square D Company
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