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DK7263C
(en)
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Keyboard for Musical Instruments.
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GB190803665A
(en)
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An Improvement in the Construction of Musical, Stringed Instruments
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AT25421B
(en)
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Electric keyboard instrument.
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CH34766A
(en)
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Innovation on two-course string instruments
|
|
FR351869A
(en)
|
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New musical instrument
|
|
CA99954A
(en)
|
|
Keyboard for musical instruments
|
|
DK7847C
(en)
|
|
String piano.
|
|
AU473405B
(en)
|
|
Tracker-board for musical instruments
|
|
CH34869A
(en)
|
|
Piano key
|
|
FR360154A
(en)
|
|
English keys
|
|
FR353740A
(en)
|
|
Piano Mechanism
|
|
FR362475A
(en)
|
|
Piano Improvements
|
|
FR367566A
(en)
|
|
Piano violin
|
|
DK10791C
(en)
|
|
Mechanical Keyboard Instrument.
|
|
FR377554A
(en)
|
|
Keyboards for musical instruments
|
|
AT37156B
(en)
|
|
Transposition device for keyboard instruments.
|
|
CH38041A
(en)
|
|
Arched soundboard for pianos
|
|
FR360901A
(en)
|
|
Stringed musical instruments
|
|
DK7544C
(en)
|
|
Device for writing down pieces of music played on keyboard instruments.
|
|
CA95771A
(en)
|
|
Self-playing piano
|
|
AT23610B
(en)
|
|
String instrument.
|
|
FR356585A
(en)
|
|
English key
|
|
CH36725A
(en)
|
|
Stringed instrument
|
|
CA93658A
(en)
|
|
Musical instrument
|
|
CA94276A
(en)
|
|
Musical instrument
|