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

Dexter R. Plummer

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Clinometer

Geometrical instruments – Indicator of direction of force traversing natural media – Level or plumb – terrestrial gravitation responsive
Patent

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Liquid flow meter

Measuring and testing – Volume or rate of flow – Expansible chamber
Patent

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Method of typewriting or printing

Typewriting machines – Typing by other than type-face or type-die
Patent

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Optical compensators for cinematography

Optics: motion pictures – Optical rectifier type – Reflector displaced
Patent

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Optical scanner

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

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Profile ID: LFUS-PAI-P-705726

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