4. Valves and valve actuation
  5. Blow-out preventers

Friedrich E. Just

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Annular blowout preventer

Valves and valve actuation – Blow-out preventers
Patent

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Blowout preventer with tubing aligning apparatus

Wells – Above ground apparatus – With assembly or disassembly means
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Wellhead shearing apparatus

Wells – Means for perforating – weakening – bending or separating pipe... – With disparate below ground feature
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Profile ID: LFUS-PAI-P-1227175

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