4. Boring or penetrating the earth
  5. Below-ground impact members
  6. With releasable means to detachably retain telescoping...

Empire Oil Tool Company

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Apparatus for connecting motors in tandem

Boring or penetrating the earth – Below-ground impact members – With releasable means to detachably retain telescoping...
Patent

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Drive having a plurality of thrust bearings

Patent

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Fluid driven motor having improved blade construction

Rotary expansible chamber devices – Non-metallic working member – cylinder or partition – Resilient
Patent

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Gear system

Machine element or mechanism – Rotary member or shaft indexing – e.g. – tool or work turret – Preselected indexed position
Patent

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Gear system for an oil well drive

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

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Profile ID: LFUS-PAI-P-207523

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