4. Hydraulic and earth engineering
  5. Temperature modification or control of earthen formation
  6. Heating

Robert R. Holman

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Apparatus for sealing access holes to cavities within the earth

Hydraulic and earth engineering – Temperature modification or control of earthen formation – Heating
Patent

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Releasable, high-pressure seal and method of forming same

Seal for a joint or juncture – Seal between relatively movable parts – Relatively rotatable radially extending sealing face member
Patent

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Profile ID: LFUS-PAI-P-1268162

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