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DK13132C
(en)
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Diaphragm for Acoustic and Musical Instruments.
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DK14980C
(en)
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Voice recorder for musical instruments.
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|
FR418472A
(en)
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Piano violin
|
|
ES49407A1
(en)
|
|
Improvements in acoustic instruments.
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|
FR423356A
(en)
|
|
Telephone instruments
|
|
DK14949C
(en)
|
|
Resonance box for acoustic instruments.
|
|
DK14383C
(en)
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|
Keyboard for Pianos, Organs and similar Musical Instruments.
|
|
CH47974A
(en)
|
|
Vibrating diaphragm for acoustic instruments
|
|
FR413924A
(en)
|
|
Piano Improvements
|
|
FR424329A
(en)
|
|
Acoustic horn
|
|
FR386276A
(en)
|
|
Acoustic horn
|
|
GB191111003A
(en)
|
|
An Improved Violin Piano.
|
|
GB191102610A
(en)
|
|
An Improved Mute for Violins and other Stringed Instruments.
|
|
GB191110561A
(en)
|
|
An Improved Bowed Stringed Musical Instrument.
|
|
FR435842A
(en)
|
|
String instruments with amplified sounds
|
|
CH51653A
(en)
|
|
Piano zither
|
|
FR403982A
(en)
|
|
Acoustic horn
|
|
GB191028163A
(en)
|
|
Bowing-device for Sounding Stringed Musical Instruments.
|
|
DK17044C
(en)
|
|
Device for Pianos and Other String Instruments for Regulating the Sound.
|
|
GB191205325A
(en)
|
|
Improvements in Bowed Stringed Musical Instruments.
|
|
FR419817A
(en)
|
|
Acoustic membrane
|
|
CH50840A
(en)
|
|
Self-playing piano
|
|
DK23140C
(en)
|
|
Device for amplification and reproduction of sound waves.
|
|
GB191023568A
(en)
|
|
Improvements in Key-board Musical Instruments.
|
|
ES45575A1
(en)
|
|
Improvements in acoustic instruments.
|