Electronic metronome

Details Electronic metronome Electronic metronome

1976-12-13

1978-10-17

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Time-measuring instrument or casing

Metronome

D1003

Patent

active

D02499363

REFERENCES:
patent: D150676 (1948-08-01), Brusseau
patent: D189304 (1960-11-01), Wittner
patent: D192641 (1962-04-01), Harkins
patent: D216036 (1969-11-01), Levin
patent: 3263551 (1966-08-01), Musser

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