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  1. Resistance transferred from rock into drill stem when bit is being fed at a faster rate than the bit can cut. Long
  2. Pressure applied to the underside of the piston in the hydraulic-feed cylinder to partially support the weight of the drill rods and hence reduce pressure on the bit. Long
  3. Rock pressures affecting the uppermost portion or roof in an underground mine opening. Long

Source: Dictionary of Mining, Mineral, and Related Terms

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