4. Radiant energy
  5. Photocells; circuits and apparatus
  6. Photocell controls its own optical systems

North American Mfg. Co.

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Immersion tube heater treater improved immersion tube heater tre

Stoves and furnaces – Liquid heater – Fluid fuel burner for other than top-accessible vessel
Patent

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Light detector particularly adapted for detecting the position o

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

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