4. Radiant energy
  5. Invisible radiant energy responsive electric signalling
  6. Fluent material level signalling

Donald P. Ames

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Device and method for monitoring fluids with a detection of cros

Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
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Oil level monitor

Radiant energy – Invisible radiant energy responsive electric signalling – Fluent material level signalling
Patent

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Profile ID: LFUS-PAI-P-1183184

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