Automatic door

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AUTOMATIC DOOR
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• An Automatic door, otherwise called an auto
  entryway, is an entryway that opens naturally,
  for the most part on detecting the methodology of
  an individual.
• In the first century AD, mathematician Heron of
  Alexandria in Roman Egypt concocted the main
  known programmed entryway. He depicted two
  distinctive programmed entryway applications. The
  main application utilized warmth from a fire lit
  by the city's sanctuary cleric. Following a
  couple of hours air pressure developed in a metal
  vessel making it siphon water into contiguous
  compartments. These holders went about as loads
  that, through a progression of ropes and pulleys,
  would open the sanctuary's entryways at about the
  time individuals were to show up for petition.
  Heron utilized a comparative application to clear
  a path for the city. Automatic Door repair

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• In 1931, engineers Horace H. Raymond and Sheldon
  S. Roby of the instrument and equipment maker
  Stanley Works planned the primary model of an
  optical gadget setting off the opening of a
  programmed entryway.