4. Optics: motion pictures
  5. With focus control

Howard J. Preston

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Automatic exposure correction system

Optics: motion pictures – With automatic diaphragm control
Patent

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Automatic focusing system for use with a motion picture camera

Optics: motion pictures – With focus control
Patent

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Automatic focusing system for use with a motion picture camera

Optics: motion pictures – With focus control
Patent

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Zoom motor control

Electricity: motive power systems – Automatic and/or with time-delay means – Movement – position – or limit-of-travel
Patent

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Profile ID: LFUS-PAI-P-463838

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