4. Spring devices
  5. Fluid
  6. Expansible-contractible chamber device

Wayne A. Kovar

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Lock-down releasing spear assembly

Wells – Grapple and well anchored lifting means
Patent

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Shock absorber assembly

Rotary shafts – gudgeons – housings – and flexible couplings for ro – Flexible coupling between fluid-conducting rotary shafts – Including member deformable by relative movement between shafts
Patent

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Shock absorber assembly for absorbing shocks encountered by a dr

Spring devices – Fluid – Expansible-contractible chamber device
Patent

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Well jar accelerator with expansion chamber

Boring or penetrating the earth – Below-ground impact members – Fluid-operated
Patent

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Profile ID: LFUS-PAI-P-308506

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