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GB507340A
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Improvements in and relating to electric discharge lamps, suitable for use in connection with sound films, picture telegraphy television and the like
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GB487412A
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Improvements in or relating to kinematographic film cameras
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GB474276A
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Improvements in or relating to sound and picture recording apparatus
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GB491067A
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Improvements in and relating to intermittent-feed mechanisms for motion picture cameras and projectors and the like
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GB468624A
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Improvements in or relating to electrostatic sound receivers and reproducers
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GB463493A
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Improvements in resistance-coupled thermionic amplifiers
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