Binary clock

Details Binary clock Binary clock

1990-07-19

1992-11-17

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Clock or clock case

Changeable exhibitor, e.g., digital type

D10 23, D10126

Patent

active

D03310191

REFERENCES:
patent: D112595 (1938-12-01), Bruce
patent: D129079 (1948-03-01), Lux
patent: 1974409 (1934-09-01), Brower
patent: 2642713 (1953-06-01), Prins
patent: 4872150 (1989-10-01), Norman

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