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

Frank J. Langley

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Apparatus for testing light-emitting devices using probe means h

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

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Universal LED testing device

Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Reexamination Certificate

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Profile ID: LFUS-PAI-P-1421841

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