4. Rotary expansible chamber devices
  5. Multistage

Vsesojuzny Nauchno-Issledovatelsky Institut Burovoi Tekhniki

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Bottom hole motor for driving rock-breaking tool

Boring or penetrating the earth – With below-ground tool drive prime mover – Fluid rotary type
Patent

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Downhole screw motor

Boring or penetrating the earth – With below-ground tool drive prime mover – Fluid rotary type
Patent

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Screw machine having a plurality of symmetrically arranged rotor

Rotary expansible chamber devices – Multistage
Patent

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