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nbsp 0183 32 ENT Surgical Instruments 104 Sommerfield Drive Gordonsville VA USA telephone 540 832 5000 toll free USA 1 800 210 2677 fax 540 832 5515 web email inquiry...
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nbsp 0183 32 Existing cone-type drill bits are prone to problems such as high rates of wear and tear and short life Lehmann et al 2017 When deep wells are drilled frequent lifting is needed to avoid bit loosening or loss which consumes much time and money...
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