4. Radiant energy
  5. Photocells; circuits and apparatus
  6. Photocell controlled circuit

David L. Hollis

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Automatic focusing system

Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent

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Constant power telephone line circuit

Telephonic communications – Subscriber line or transmission line interface – Network interface device
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Pulse discriminator circuit

Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent

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Profile ID: LFUS-PAI-P-787907

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