4. Boring or penetrating the earth
  5. Processes
  6. Boring curved or redirected bores

Wirth Maschinen-Und Bohrgerate-Fabrik GmbH

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Apparatus for clamping to the end of a pipe

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

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Apparatus for interchangeable mounting of rollers, particularly

Metal deforming – By deflecting successively-presented portions of work during... – By use of deflected arranged to provide longitudinally...
Patent

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Apparatus for producing an upwardly directed drill hole

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

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Automatic control system and method for a machine used for excav

Mining or in situ disintegration of hard material – Automatic control; signaling or indicating – Of hard material disintegrating machine
Patent

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Holding device for boring head tools or the like

Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Patent

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