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GB686777A
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Improvements in electrical sound recording and reproducing apparatus
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GB650808A
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Improvements in electrical sound reproducing apparatus
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GB650769A
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Improvements in electrical sound recording apparatus
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GB475788A
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Improvements in electric pick-up mechanisms
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GB467675A
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Improvements in pick-up devices for phonographs
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GB442361A
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Improvements in pick-up devices
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GB439800A
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Improvements in pick-up devices for reproducing sound records applicable also to recording apparatus
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GB358925A
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Improvements in sound recording and reproducing tools and in records cut or reproduced thereby
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GB332909A
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Improvements in sound recording apparatus
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GB327410A
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Improvements in recording microphones and like apparatus
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GB320868A
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Improvements in sound reproducing machines
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GB311826A
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Improvements in electro-magnetic transmitters and receivers for reproducing sound
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GB310790A
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Long-playing sound record and means for producing the same
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GB310821A
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Traversing gear for sound recording instruments
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GB303759A
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Long-playing sound record and means for producing the same
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GB279299A
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Damping vibrations in acoustic and sound recording apparatus
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GB272622A
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Damping electrically operated vibration devices
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GB258137A
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Improvements in sound reproducing devices applicable to telephones, phonographs or the like
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GB252228A
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Improved electro-magnetic sound recording apparatus and record produced thereby
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GB253159A
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An improved loud speaker
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