4. Optics: motion pictures
  5. With sound accompaniment
  6. Common picture and sound record carrier systems
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Film advancement control for motion picture projector

Optics: motion pictures – With sound accompaniment – Common picture and sound record carrier systems
Patent

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Film feeding device for sound motion picture camera

Optics: motion pictures – With sound accompaniment – Common picture and sound record carrier systems
Patent

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Film projector with sound playback or recording

Optics: motion pictures – With sound accompaniment – Common picture and sound record carrier systems
Patent

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Film sound track recording and playback system

Optics: motion pictures – With sound accompaniment – Common picture and sound record carrier systems
Patent

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Film-transport control for sound-film camera

Optics: motion pictures – With sound accompaniment – Common picture and sound record carrier systems
Patent

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Film-transport control for sound-film camera

Optics: motion pictures – With sound accompaniment – Common picture and sound record carrier systems
Patent

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