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RU2015295C1
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Drill string vibration dampener
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Flexible member
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Apparatus for preparing drilling mud and controlling its properties
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Shock-absorber for drilling string
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Drilling string oscillation absorber
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Emergency adaptor
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Well reagent metering pump
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Apparatus for running a string of non-metal threadless casings into well
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Double-acting drilling shock-absorber
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Flexible element
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Elastic spindle of face engine
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Arrangement for inhibiting face wear of turbo-drill parts
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Deep-well agent metering-out device
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Drilling shock-absorber
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Piston
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SU575446A1
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Piston
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SU842188A1
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Drilling shock-absorber
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SU588339A1
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Drill string vibration damper
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