Keyboard musical instrument for exactly producing tones and...

Keyboard musical instrument for practicing fingering on keyboard

Keyboard musical instrument hammer movement detection apparatus

Keyboard musical instrument having an improved cover opening/clo

Keyboard musical instrument having dummy hammer with...

Keyboard musical instrument having fall board formed with...

Keyboard musical instrument having fall-board assembled with cas

Keyboard musical instrument having hammer heads formed of metall

Keyboard musical instrument having hammer stopper changed...

Keyboard musical instrument having hammer stopper exactly positi

Keyboard musical instrument having height controllable pedals

Keyboard musical instrument having jacks changeable in escape sp

Keyboard musical instrument having key action mechanisms movable

Keyboard musical instrument having key action mechanisms movable

Keyboard musical instrument having key inertia device

Keyboard musical instrument having key monitor exactly discrimin

Keyboard musical instrument having key touch controller

Keyboard musical instrument having key touch controller for givi

Keyboard musical instrument having key-touch generator changing

Keyboard musical instrument having keys equipped with...