4. Wells
  5. Valves, closures or changeable restrictors
  6. Fluid operated

Hawera Probst GmbH & Co.

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Apparatus for rock drill

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

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Boring tool for producing undercuts in holes

Cutting by use of rotating axially moving tool – Tool-support with means to move tool relative to tool-support – To move radially
Patent

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Boring tool for radial enlargement of a cylindrical foundation b

Boring or penetrating the earth – Cutter element laterally shiftable below ground – Cutter element shifted by longitudinally relatively movable...
Patent

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Drill bit having hollow cylindrical body and a plurality of PCD

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

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Drill for electronic conductor plates

Cutting by use of rotating axially moving tool – Tool or tool with support – Having peripherally spaced cutting edges
Patent

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