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GB492915A
|
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Improvements in and relating to the production of combined sound and picture films and the like
|
|
GB486117A
|
|
Improvements in recording sound on films
|
|
GB417450A
|
|
Improvements in glow discharge tubes for photographic sound recording
|
|
GB401382A
|
|
Improvements in and relating to electric discharge tubes
|
|
GB396830A
|
|
Improvements in or relating to electron discharge tubes used for the recording of sounds
|
|
GB395799A
|
|
Improvements in or relating to the construction of electron discharge tube used for the recording of sound
|
|
GB377731A
|
|
Improvements in or relating to the recording of sound on films and to the reproduction of sound from such records
|
|
GB377694A
|
|
Improvements in the production of sound records on films
|
|
GB364146A
|
|
Improvements in and relating to electrical discharge tubes for use in the recording of sound
|
|
GB359926A
|
|
Improvements in the production of sound records on films
|
|
GB365608A
|
|
Improvements in the production of sound records on films
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