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

George L. Schofield, Jr.

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Presence detecting system with self-checking

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

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Solid state self-checking relay

Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific current responsive fault sensor
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Profile ID: LFUS-PAI-P-787910

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