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In the middle of the hinges there is a square bit with a dot on an angle. At the four corners of the hinges, around the square, there are some numbers: -1,0,+1,+2.

Do they mean anything?

  • I'm sure they mean something to someone. What's problem are you trying to solve? – isherwood Jul 19 '16 at 15:45
  • Probably just manufacturer's quality tracking indicators, with very little practical value to anyone else. – keshlam Jul 19 '16 at 16:41

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