Digital clock

Details Digital clock Digital clock

1977-08-02

1979-09-11

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Clock or clock case

Changeable exhibitor, e.g., digital type

D1001

Patent

active

D02528541

REFERENCES:
patent: D236189 (1975-08-01), Daher
patent: D240656 (1976-07-01), Imai
patent: D249651 (1976-09-01), Hirosawa

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