4. Boring or penetrating the earth
  5. With heating or cooling drilling fluid
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Device for sampling soils and retaining volatiles therein and me

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

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Downhole drilling tool cooling system

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

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Drill fluid powered hydraulic system

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

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Drilling fluid cooling system

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

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