4. Radiant energy
  5. Photocells; circuits and apparatus
  6. Photocell controls its own optical systems

Kenneth Crabtree

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Cursor apparatus for interactive graphic display system

Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent

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Method and apparatus for sensing the position of a writing laser

Optics: measuring and testing – By particle light scattering – With photocell detection
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Profile ID: LFUS-PAI-P-404678

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