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bar coal cutter

A coal cutter in which the cutting member was a projecting rotating bar armed with picks throughout its length. The bar cut a kerf in the seam as the machine traveled along the face. The first patent for a bar machine was taken out in 1856. The cutter is now obsolete.

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Penulis

  • ed.young
  • (Milwaukee, United States)

  •  (V.I.P) 21084 poin
  • 100% positive feedback
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