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Filter for subterranean use

E - Fixed Constructions – 21 – B
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Filter for subterranean wells

E - Fixed Constructions – 21 – B
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Filter for subterranean wells

E - Fixed Constructions – 21 – B
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Filter raiser for filtered infiltration well

E - Fixed Constructions – 21 – B
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Filtered actuator port for hydraulically actuated downhole...

E - Fixed Constructions – 21 – B
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Filtering and detection of telemetry

E - Fixed Constructions – 21 – B
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Filtering tube provided with slotted perforations and...

E - Fixed Constructions – 21 – B
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Filters for canceling multiple noise sources in borehole...

E - Fixed Constructions – 21 – B
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Fine particle size cement compositions and methods

E - Fixed Constructions – 21 – B
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Fines control in deviated wells

E - Fixed Constructions – 21 – B
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Finger boot basket

E - Fixed Constructions – 21 – B
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Finger latch actuation sensor

E - Fixed Constructions – 21 – B
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Fingerboard with pneumatically actuated finger latches

E - Fixed Constructions – 21 – B
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Finned impact operated boring tool

E - Fixed Constructions – 21 – B
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Fire extinguishing apparatus for burning gas-and oil-wells

E - Fixed Constructions – 21 – B
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Fire flood process

E - Fixed Constructions – 21 – B
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Fire resistant connections and u-like sealing means therefor

E - Fixed Constructions – 21 – B
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Fire suppression system for an automated mining system

E - Fixed Constructions – 21 – F
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Fireproof element and its fabrication

E - Fixed Constructions – 21 – D
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Firing head

E - Fixed Constructions – 21 – B
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