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

Robert C. Helfrich, Jr.

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Ambient light sensor touch switch system and method

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

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Control system for refrigerator with through-the-door quick-chil

Refrigeration – With indicator or tester – Operatively correlated with automatic control
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Profile ID: LFUS-PAI-P-969779

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