4. Optics: motion pictures
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  6. Methods
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Portable slating device

Optics: motion pictures – With sound accompaniment – Methods
Patent

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Process and apparatus for transferring in synchronism, onto comm

Optics: motion pictures – With sound accompaniment – Methods
Patent

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Process for viewing a positive motion picture film scene...

Optics: motion pictures – With sound accompaniment – Methods
Reexamination Certificate

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