Electronic clock

Details Electronic clock Electronic clock

1986-01-21

1988-11-08

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Clock or clock case

Changeable exhibitor, e.g., digital type

D10 23

Patent

active

D02984148

REFERENCES:
patent: D37411 (1905-04-01), McGraw
patent: D94765 (1935-03-01), Irelan
patent: D110124 (1938-06-01), Schlenker
patent: D122309 (1940-09-01), Bruce
patent: D166364 (1952-04-01), Thornton
patent: D254124 (1980-02-01), Greenfield
patent: D285908 (1986-09-01), Maron
patent: D289740 (1987-05-01), Ketner
patent: 2642713 (1953-06-01), Prins

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