4. Boring or penetrating the earth
  5. Boring by directly applying heat to fluidize or comminute
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Flame drill channelling method and apparatus for reducing noise

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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Flame jet tool for drilling cross-holes

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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Flame jet tool for drilling to great depths

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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Flexible conduit for effecting lateral channelling in coal or oi

Boring or penetrating the earth – Boring by directly applying heat to fluidize or comminute – Combustion of the formation material
Patent

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Focused shock spark discharge drill using multiple electrodes

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

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