Measuring – testing – or signalling instruments – Security or signal instrument or casing – Aural – i.e. – audible
Patent
1978-11-15
1981-04-07
Lucas, Susan J.
Measuring, testing, or signalling instruments
Security or signal instrument or casing
Aural, i.e., audible
D1006
Patent
active
D02588099
REFERENCES:
patent: 389841 (1888-09-01), Harrington
patent: 1291550 (1919-01-01), Kirk
Burns Robert E.
Lucas Susan J.
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