4. Boring or penetrating the earth
  5. With heating or cooling drilling fluid
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Apparatus for producing deep boreholes

Boring or penetrating the earth – With heating or cooling drilling fluid
Patent

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Apparatus for the cooling of drilling liquids

Boring or penetrating the earth – With heating or cooling drilling fluid
Reexamination Certificate

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Apparatuses and methods relating to cooling a subterranean...

Boring or penetrating the earth – With heating or cooling drilling fluid
Reexamination Certificate

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