4. Boring or penetrating the earth
  5. With tool drive prime mover or above-ground mechanical...
  6. With diversely operated shafts extending into bore

Duk-Won Park

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Borehole stress-meter and method and apparatus for the installat

Measuring and testing – Specimen stress or strain – or testing by stress or strain... – Earth stresses
Patent

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Roof bolt hole groover

Boring or penetrating the earth – With tool drive prime mover or above-ground mechanical... – With diversely operated shafts extending into bore
Patent

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Profile ID: LFUS-PAI-P-493865

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