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

Douglas E. Franklin

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Apparatus and method for testing wooden poles

Measuring and testing – Vibration – Resonance – frequency – or amplitude study
Patent

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Method and apparatus for determining the distance of an object

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

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Profile ID: LFUS-PAI-P-1035080

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