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Keywords:
TUBE HEADINGS LTD,
HORIZONTAL,
EARTH,
BORING,
THRUST,
GROUND,
CONDITIONS,
SCREWS,
JACKS,
HYDRAULIC,
RAMS,
BORERS,
PNEUMATIC,
VIBRATIONS,
AUGER,
RIGS,
DRILLING,
PIPEJACKING,
JACKING,
PIPES,
TUBES,
SHIELDS
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© Thomas Telford and ICE
1967
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