Digital darkroom timer

Details Digital darkroom timer Digital darkroom timer

1976-12-06

1979-01-30

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Time-measuring instrument or casing

D1003

Patent

active

D02509342

REFERENCES:
patent: D212493 (1968-10-01), Newman
patent: D232815 (1974-09-01), Wiwell
patent: D243619 (1977-03-01), Olsson

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