Measuring – testing – or signalling instruments – Clock or clock case – Changeable exhibitor – e.g. – digital type
Patent
1977-04-04
1980-06-03
Holtje, Nelson C.
Measuring, testing, or signalling instruments
Clock or clock case
Changeable exhibitor, e.g., digital type
D1001
Patent
active
D02552230
REFERENCES:
patent: D170391 (1953-09-01), Tailer
patent: D208927 (1967-10-01), Thomas
patent: D220544 (1971-04-01), Ungar
patent: D241231 (1976-08-01), Simons
patent: D242030 (1976-10-01), Thompson
Design-12/73-p. 6--Clock at bottom-right.
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