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

Avron M. Zwilling

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Scale structures and methods usable in an absolute position...

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

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Two-dimensional scale structures and method usable in an...

Optics: measuring and testing – By shade or color – With color transmitting filter
Reexamination Certificate

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Profile ID: LFUS-PAI-P-2679558

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