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

Lawrence R. Hill

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Acoustic keyboard

Communications: electrical – Audible indication – Percussion-type sound producer
Patent

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Method of making an optocoupler

Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
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Method of obtaining polycrystalline silicon

Plastic and nonmetallic article shaping or treating: processes – Gas or vapor deposition of article forming material onto...
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Profile ID: LFUS-PAI-P-242704

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