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GB337979A
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Improvements in or relating to sound-reproducing machines and apparatus
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GB339073A
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Improvements in or connected with sound and picture recording or reproducing apparatus
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GB336451A
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Improvements in or connected with synchronised sound reproduction and picture projection
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GB336110A
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Improvements in or connected with kinematograph apparatus
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GB319791A
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Synchronizing means for motion picture projectors and sound reproducing mechanisms
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GB319280A
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Synchronised sound reproducing and motion picture machine
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