Musical keyboard

Recording – communication – or information retrieval equipment – Video or audio transmission – recording or playback equipment – Telephone equipment

Patent

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D17 1

Patent

active

D03713520

REFERENCES:
patent: D344971 (1994-03-01), Roose
patent: D345967 (1994-04-01), Kroner
patent: D354053 (1995-01-01), Kao
patent: D358808 (1995-05-01), Murdoch et al.
patent: 5392682 (1995-02-01), McCartney-Hoy

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