Metronome

Details Metronome Metronome

1977-10-20

1979-11-13

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Time-measuring instrument or casing

Metronome

D1004

Patent

active

D02533995

REFERENCES:
patent: D189304 (1960-11-01), Wittner
patent: D216036 (1969-11-01), Levin
patent: D225361 (1972-12-01), Williams
patent: D249936 (1978-10-01), Ishida
patent: 3724203 (1973-04-01), Wittner

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