Electronic keyboard instrument

Musical instruments – Keyboard type

Design Patent

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Design Patent

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29283383

CLAIM:
The ornamental design for an electronic keyboard instrument, as shown.

REFERENCES:
patent: D305772 (1990-01-01), Kitsuyu
patent: D312265 (1990-11-01), Naito
patent: D319248 (1991-08-01), Mine
patent: D326107 (1992-05-01), Amiya
patent: D345369 (1994-03-01), Ito
patent: D346617 (1994-05-01), Oki
patent: D348279 (1994-06-01), Nakada
patent: D404059 (1999-01-01), Miura et al.
patent: D417884 (1999-12-01), Katsumata
patent: D546374 (2007-07-01), Saito
patent: D555710 (2007-11-01), Suzuki

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