4. Electricity: measuring and testing
  5. Magnetic
  6. With means to create magnetic field to test material

Marcel Lefebvre

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Direct current proximity detector having switching means which p

Electricity: measuring and testing – Magnetic – With means to create magnetic field to test material
Patent

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Photo-electric detector with temperature-compensated circuit

Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
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Transistor switching means

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-26918

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