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GB374180A
|
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Improvements in or relating to electrical reproducer devices for use with gramophonerecords
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|
US1795263A
|
|
Electromagnetic reproducer
|
|
US1792830A
|
|
Phonograph adapter
|
|
US1804364A
|
|
Pickup
|
|
GB358540A
|
|
Improvements relating to sound film optical systems
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|
GB351684A
|
|
Improvements in film feed mechanism particularly for soundrecording or reproducing apparatus
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|
US1831787A
|
|
Device for converting energy
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|
US1916162A
|
|
Electric reproducer
|
|
US1839217A
|
|
Photo electric system
|
|
US1779231A
|
|
Electric phonograph reproducer
|
|
US1779247A
|
|
Phonograph pick-up
|
|
US1756012A
|
|
Phonograph pick-up
|
|
GB322010A
|
|
Improvements in or relating to electrical connecting devices
|
|
US1728755A
|
|
Speaker unit
|
|
GB278930A
|
|
Improvements in or relating to electrical resistance devices
|
|
US1803040A
|
|
Voltage supply and power amplifier unit
|
|
US1842351A
|
|
Connection for power amplifiers
|
|
US1734432A
|
|
Electrical connection
|
|
US1559358A
|
|
Vacuum-tube adapter
|
|
GB238462A
|
|
Improvements in or relating to variable resistance devices
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