4. Boring or penetrating the earth
  5. Boring without earth removal

Institut Gornogo Dela SO AN SSSR

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Annular air-hammer apparatus for drilling holes

Boring or penetrating the earth – With below-ground tool drive prime mover
Patent

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Device for making holes in soil

Boring or penetrating the earth – Boring without earth removal
Patent

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Reversible air-operated percussive action machine for driving ho

Boring or penetrating the earth – Boring without earth removal
Patent

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