Measuring – testing – or signalling instruments – Security or signal instrument or casing – Aural – i.e. – audible
Patent
1984-01-09
1986-03-18
Rademaker, Charles A.
Measuring, testing, or signalling instruments
Security or signal instrument or casing
Aural, i.e., audible
D21129
Patent
active
D02830175
REFERENCES:
patent: D43806 (1913-04-01), Tollefson
patent: D53856 (1919-09-01), Monosmith
patent: D173649 (1954-12-01), Fleishman
patent: D263382 (1982-03-01), Moore
Kettelson Ernest
Rademaker Charles A.
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