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Tower having raising and lowering means

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

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Trailer mounted high floor drilling mast and substructure arrang

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

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Undercarriage for a telescopic frame

Static structures (e.g. – buildings) – Mechanism operated relatively movable shaft assembly – Longitudinally extensible by flexible drive or hoist
Reexamination Certificate

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Van with extensible boom

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

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Well working rig

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

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Wheeled portable trailer substructure for elevatable drawworks,

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

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Wheeled portable well drilling and workover apparatus

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

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