4. Valves and valve actuation
  5. Blow-out preventers
  6. Radial reciprocating ram

David M. Callahan

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Blowout preventer with removable packer

Valves and valve actuation – Blow-out preventers – Radial reciprocating ram
Patent

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System and method for automatically matching programmable...

Data processing: generic control systems or specific application – Generic control system – apparatus or process – Supervisory control
Reexamination Certificate

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Profile ID: LFUS-PAI-P-139519

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