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GB2077499A
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Multi-position electric switch
|
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GB1547406A
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Gramophone pick-ups
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GB1378294A
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Separable ear defender
|
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GB1364718A
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Phonographic record cleaning devices
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DE2038839A1
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Soundproofing device for ears
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GB1342353A
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Phtometric apparatus
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GB1319786A
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Photographic processes
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GB1338092A
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Transducers
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GB1136794A
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Improvements in and relating to microphones
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GB1136601A
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Improvements in and relating to gramophone pickups
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GB976990A
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Improvements in and relating to gramophone pickups
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GB1037417A
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Improvements in and relating to transducers
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GB974516A
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Improvements in and relating to apparatus for detecting the presence of magnetic objects
|
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GB998841A
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Improvements in and relating to transducers
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GB970870A
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Improvements in and relating to magnetic devices
|
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GB970166A
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Improvements in and relating to sound recording and reproducing devices
|
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GB1002765A
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Improvements in and relating to electro-acoustic apparatus
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GB963219A
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Improvements in and relating to sound recording and reproducing apparatus
|
|
US3114122A
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Transducers
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GB942533A
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Improvements in and relating to gramophone pickups
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