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flat cut

A manner of placing the boreholes, for the first shot in a tunnel, in which they are started about 2 to 3 ft (0.6 to 0.9 m) above the floor and pointed downward so that the bottom of the hole is about level with the floor.

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Penulis

  • ed.young
  • (Milwaukee, United States)

  •  (V.I.P) 21084 poin
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