4. Static structures (e.g., buildings)
  5. Mechanism operated relatively movable shaft assembly
  6. Tilts relative to base
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Derrick having upper and lower crown block positions

Static structures (e.g. – buildings) – Mechanism operated relatively movable shaft assembly – Tilts relative to base
Patent

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Device for raising and lowering elongated support structures

Static structures (e.g. – buildings) – Mechanism operated relatively movable shaft assembly – Tilts relative to base
Patent

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Drilling derrick assembly

Static structures (e.g. – buildings) – Mechanism operated relatively movable shaft assembly – Tilts relative to base
Patent

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Drilling equipment tower raising mechanism

Static structures (e.g. – buildings) – Mechanism operated relatively movable shaft assembly – Tilts relative to base
Patent

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Drilling ramp

Static structures (e.g. – buildings) – Mechanism operated relatively movable shaft assembly – Tilts relative to base
Patent

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Drilling rig

Static structures (e.g. – buildings) – Mechanism operated relatively movable shaft assembly – Tilts relative to base
Patent

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Drilling rig with improved mast support structure

Static structures (e.g. – buildings) – Mechanism operated relatively movable shaft assembly – Tilts relative to base
Patent

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Dual swing-up elevator well drilling apparatus

Static structures (e.g. – buildings) – Mechanism operated relatively movable shaft assembly – Tilts relative to base
Patent

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