Combined grand piano keyboard cover and auto-play control unit

Details Combined grand piano keyboard cover and auto-play control unit Combined grand piano keyboard cover and auto-play control unit

1987-05-19

1990-10-16

Feifer, Melvin B.

Musical instruments

Keyboard type

Element or attachment

Patent

active

D03114120

REFERENCES:
patent: D248993 (1978-08-01), Oliver et al.
patent: D255366 (1980-06-01), Karaki et al.
patent: D256130 (1980-07-01), Ohta
patent: 3969970 (1976-07-01), Swift et al.

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