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Welsh notch

A form of joint between the tubing used to line a collar (or a crossbar) and the arms (or uprights) of a timber set; developed in the Welsh coal mines. A Welsh notch is designed to be equally effective in resisting side and roof pressure.

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Penulis

  • ed.young
  • (Milwaukee, United States)

  •  (V.I.P) 21084 poin
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