Electronic keyboard musical instrument

Musical instruments – Keyboard type

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D17 5, 1701

Patent

active

D04012658

REFERENCES:
patent: D325924 (1992-05-01), Yu
patent: D345755 (1994-04-01), Igo et al.
patent: D346617 (1994-05-01), Oki
patent: D348687 (1994-07-01), Ono
patent: 5164528 (1992-11-01), Arai et al.
Brochure, Yamaha Portable Keyboard, Item PSS-6, printed on Sep. 1995.
Brochure, Yamaha Portable Keyboard, Items PSS-11 and PSS-102, printed on Sep. 1992.
Hong Kong Enterprise, p. 496 (Angeltone's DM230 keyboard), Jun. 1995.

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