4. Boring or penetrating the earth
  5. Boring by directly applying heat to fluidize or comminute
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Burner apparatus for making holes in coal seams

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

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Burners for flame jet drill

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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