4. Boring or penetrating the earth
  5. Cutter element laterally shiftable below ground
  6. Cutter element shifted by fluid pressure

Albert G. Zainullin

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Apparatus for manufacturing profile pipes used in well construct

Metal deforming – By pulling workpiece through closed periphery die – Producing a non-uniform product
Patent

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Arrangement for patching off troublesome zones in a well

Wells – Means for perforating – weakening – bending or separating pipe... – With disparate below ground feature
Patent

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Method of construction of multiple-string wells

Boring or penetrating the earth – Processes
Patent

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Well reamer

Boring or penetrating the earth – Cutter element laterally shiftable below ground – Cutter element shifted by fluid pressure
Patent

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Profile ID: LFUS-PAI-P-531508

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