4. Education and demonstration
  5. Occupation
  6. Electricity or electronics

John C. Freeborn

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Automatic teaching apparatus and method

Education and demonstration – Occupation – Electricity or electronics
Patent

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Automatic-cycling heat-powered fluid pump

Pumps – Motor driven – Fluid motor
Patent

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Signal transmission circuit with improved digital signal recover

Radiant energy – Ionic separation or analysis – Static field-type ion path-bending selecting means
Patent

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Profile ID: LFUS-PAI-P-1770967

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