Electronic visual metronome

Details Electronic visual metronome Electronic visual metronome

1985-06-17

1988-05-17

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Time-measuring instrument or casing

Metronome

84484

Patent

active

D02957280

REFERENCES:
patent: D161263 (1950-12-01), Jansen
patent: D225361 (1972-12-01), Williams
patent: D249936 (1978-10-01), Ishida
patent: D253399 (1979-11-01), Harle
patent: 3467959 (1969-09-01), Zazufsky
patent: 4193257 (1980-03-01), Watkins
patent: 4333172 (1982-06-01), Chen
patent: 4583443 (1986-04-01), Senghaas

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