4. Boring or penetrating the earth
  5. Boring by directly applying heat to fluidize or comminute
  6. Electrically produced heat
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Earth boring apparatus employing high powered laser

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

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Earth boring method employing high powered laser and alternate f

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

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