4. Boring or penetrating the earth
  5. Boring by directly applying heat to fluidize or comminute
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High-pressure pipe string for continuous fusion drilling of deep

Boring or penetrating the earth – Boring by directly applying heat to fluidize or comminute
Patent

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Hydro-mechanical device for underground drilling

Boring or penetrating the earth – Boring by directly applying heat to fluidize or comminute – Combustion is confined chamber having restricted discharge...
Patent

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