4. Hydraulic and earth engineering
  5. Underground passageway, e.g., tunnel
  6. Lining

Raymond L. Weholt

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Insulated tunnel liner and rehabilitation system

Hydraulic and earth engineering – Underground passageway – e.g. – tunnel – Lining
Patent

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Insulating tunnel liner system

Hydraulic and earth engineering – Underground passageway – e.g. – tunnel – Lining
Patent

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Portable placer exploration and sampling apparatus

Boring or penetrating the earth – With tool shaft detail – Helix or helically arranged structure
Reexamination Certificate

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Profile ID: LFUS-PAI-P-1634392

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