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GB680833A
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Manufacture of plastic articles, for example, gramophone records
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GB405801A
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Improvements in or relating to cinematograph films and other strips and to means forstoring and winding them
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GB411144A
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Improvements in or relating to the recording and reproducing of sound and like vibrations
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GB408001A
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Improvements in or relating to the mechanical recording of oscillations
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GB408222A
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Improvements in or relating to carriers adapted to receive mechanically produced records of sound or the like which are reproducible by optical means
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GB407027A
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Improvements in the recording of vibrations
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GB403164A
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Improvements in or relating to the recording of sound
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GB404990A
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Improvements in or relating to the recording of vibrations
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GB404948A
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Improvements in or relating to the recording of vibrations
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GB399631A
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Improvements in or relating to the making of a record of vibrations which is reproducible by optical means
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