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Maker claims the pneumatic hammer can drill 6.25-in.-diameter holes at penetration rates of up to 150 ft. per hour HammerHead claims its Roughneck R500 rock drilling system can turn any horizontal ...

The ROUGHNECK R600 pneumatic percussion drilling system for use in horizontal directional drilling applications can drill solid rock with bit diameters of 7.25 to 8 in.

Scientific American is part of Springer Nature, which owns or has commercial relations with thousands of scientific publications (many of them can be found at www ...

Scientific American is part of Springer Nature, which owns or has commercial relations with thousands of scientific publications (many of them can be found at www ...