4. Boring or penetrating the earth
  5. Boring by directly applying heat to fluidize or comminute
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Plasma channel drilling process

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

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Pressure pulse fracturing system

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

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Process and a device for establishing drilling 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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Profile melting-drill process and device

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

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Pulsed electric rock drilling apparatus

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

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