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

Gary S. Harsmann

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Bore hole drilling device

Boring or penetrating the earth – Processes – Boring horizontal bores
Patent

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Mine stopping having a swinging door

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

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Restrainable manhole cover, handhole cover and the open/close de

Road structure – process – or apparatus – Pavement – Vault cover-closure
Patent

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Profile ID: LFUS-PAI-P-1152892

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