|
US2021843A
|
|
Automatic tuning changer for radio receiving sets
|
|
US2002236A
|
|
Automatic phonograph
|
|
US1978651A
|
|
Tuning indicator for radios
|
|
US1820865A
|
|
Expression device for musical instruments
|
|
US2039756A
|
|
Automatic phonograph
|
|
US1769184A
|
|
Automatic musical instrument
|
|
US1800537A
|
|
Coin-controlled attachment for phonographs
|
|
US1669391A
|
|
Tracker mechanism for musical instruments
|
|
US1810359A
|
|
Automatic musical instrument
|
|
US1851258A
|
|
Controlling device for coin operated musical instruments
|
|
US1769369A
|
|
Sostenuto device for organs
|
|
US1665653A
|
|
Piano fall board
|
|
US1621973A
|
|
Combination stop mechanism for organs
|
|
US1654592A
|
|
Drum
|
|
US1671987A
|
|
Automatic musical instrument
|
|
US1604467A
|
|
Electropneumatic organ valve
|
|
US1687028A
|
|
Piano
|
|
US1536150A
|
|
Pneumatic action for musical instruments
|
|
US1623098A
|
|
Contact block for electric organs and the like
|
|
US1578182A
|
|
Pneumatic action
|
