4. Radiant energy
  5. Photocells; circuits and apparatus
  6. Optical or pre-photocell system

Helmut Rube

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Apparatus and method for sensing the perforations in a perforate

Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent

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Method and apparatus for automatic implementation of fade-in, fa

Optics: motion pictures – Special effects – Transition effects
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Profile ID: LFUS-PAI-P-452454

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