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

George A. L. Leenknegt

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Optical scanning apparatus including beam focal point position c

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

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Positioning system and apparatus including the positioning...

Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Reexamination Certificate

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Profile ID: LFUS-PAI-P-1898640

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