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Wagon e.g. crawler drill wagon

E - Fixed Constructions – 21 – B
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Walking substructure device

E - Fixed Constructions – 21 – B
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Wall contacting tool

E - Fixed Constructions – 21 – B
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Warning device to prevent clutch burning on a well service rig

E - Fixed Constructions – 21 – B
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Wash tool

E - Fixed Constructions – 21 – B
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Washing a cylindrical cavity

E - Fixed Constructions – 21 – B
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Washout method and apparatus

E - Fixed Constructions – 21 – B
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Washpipe apparatus

E - Fixed Constructions – 21 – B
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Washpipe stabilisation

E - Fixed Constructions – 21 – B
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Waste component removal from crude oil or gas

E - Fixed Constructions – 21 – B
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Waste gases dispersant installation

E - Fixed Constructions – 21 – B
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Waste mud agitation system

E - Fixed Constructions – 21 – B
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Waste solid cleaning apparatus

E - Fixed Constructions – 21 – B
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Wastewater disposal with in situ steam production

E - Fixed Constructions – 21 – B
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Water absorbing polymers for treatment of brines and...

E - Fixed Constructions – 21 – B
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Water and drill casing units

E - Fixed Constructions – 21 – B
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Water based compositions for sealing subterranean zones and...

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Water based foaming composition - method for making same

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Water control

E - Fixed Constructions – 21 – B
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Water control device using electromagnetics

E - Fixed Constructions – 21 – B
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