Measuring – testing – or signalling instruments – Clock or clock case – Changeable exhibitor – e.g. – digital type
Patent
1978-01-16
1980-05-27
Holtje, Nelson C.
Measuring, testing, or signalling instruments
Clock or clock case
Changeable exhibitor, e.g., digital type
D10 9, D1001
Patent
active
D02551012
REFERENCES:
patent: D241626 (1976-09-01), Durco
patent: D245581 (1977-08-01), Thrasher
patent: D246158 (1977-10-01), Durco
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