4. Boring or penetrating the earth
  5. Boring a submerged formation

Walter Thomas Welsh

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Cantilever supported drilling rig

Hydraulic and earth engineering – Marine structure or fabrication thereof – With horizontally movable work deck
Reexamination Certificate

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Crown block dead line anchor

Implements or apparatus for applying pushing or pulling force – Device or member for contacting and guiding moving cable – Including rotatable – cable contacting – pulley wheel element
Reexamination Certificate

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Heave compensator for drill ships

Boring or penetrating the earth – Boring a submerged formation
Patent

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Profile ID: LFUS-PAI-P-1915587

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