photoelectric control in a sentence

"photoelectric control" meaning  "photoelectric control" in Chinese  
  1. Furthermore, before the invention of photoelectric controls, a single switch or clock could control all the lights in an entire district.
  2. A variety of upgrades and innovations were applied to the light in the early twentieth century, including an experimental photoelectric control for the fog signal installed in 1936.
  3. A variation of this technology is the'differential switching or dead-band'photoelectric control which has multiple illuminances it switches from so as not to disturb occupants as much.
  4. It's difficult to find photoelectric control in a sentence.

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