4. Hydraulic and earth engineering
  5. Foundation
  6. Columnar structure

Josef Roob

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Elevator for casing

Handling: hand and hoist-line implements – Hook – hoistline – or grab type – Locking device
Patent

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Method and apparatus for sinking a cased borehole for producing

Boring or penetrating the earth – With below-ground tool drive prime mover – With below-ground feed means
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Pile extraction apparatus

Hydraulic and earth engineering – Foundation – Columnar structure
Patent

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Rotary boring head

Boring or penetrating the earth – Cutter element laterally shiftable below ground – Pivoted about substantially longitudinal axis
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Profile ID: LFUS-PAI-P-778714

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