Electronic hour glass clock

Details Electronic hour glass clock Electronic hour glass clock

1976-02-09

1977-06-28

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Clock or clock case

Changeable exhibitor, e.g., digital type

D1001

Patent

active

D02448351

REFERENCES:
patent: D149262 (1948-04-01), Doolin
patent: D197474 (1964-02-01), Cullen
patent: D200968 (1965-04-01), Thompson
patent: D241859 (1976-10-01), Kmicikwicz
patent: 3438197 (1969-04-01), Roer
patent: 3744235 (1973-07-01), Kratomi

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