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FR2356334A1
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Video recording and replay - is for stationary and moving pictures and has separate audio and video recording tracks
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US4045819A
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Video recorder and playback apparatus
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US4009331A
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Still picture program video recording composing and playback method and system
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US3955466A
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Performance learning system
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US3919474A
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System for transferring motion picture films to video recordings, and for changing aspect ratios
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US3821801A
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Automatic skew corrector having tension control
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US3938189A
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System for recording and playing back individual frames of video and related audio signals
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