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

Richard P. Speck

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Light meter

Photography and optical equipment – Projector or viewer – With provision for transparency magazine
Patent

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Tactile sensing method and apparatus having grids as a means to

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

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Profile ID: LFUS-PAI-P-1362860

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