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GB1292613A
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Improvements in mechanical systems of power transmission
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ES126962A1
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Improvements in radio-transmitters, radio-receivers, amplifiers and other similar devices.
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CA351143A
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Natural colour television and cinematography
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CA335751A
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Alternating current generator
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CA329575A
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Animated picture record
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CA329576A
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Television scanning device
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CA347490A
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Television
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CA245255A
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System of synchronizing rotating bodies
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CA348975A
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Synchronous electric motor
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CA348138A
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Television apparatus
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CA332614A
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Photo-electric cell
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CA466282A
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Time delaying device
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