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14. Mai 2019
INSITE Podcast Episode 11: Die Geheimnisse des Doppelrohr-Umkehrbohrens
On this episode of the INSITE podcast, Geo Jon and Brittney interview Mike Van Aacken,… Weiterlesen >>
August 14, 2017 | James Burris
This article originally appeared in Coal International. DTFR: DRILL LARGE-DIAMETER HOLES Dual-tube flooded reverse circulation… Mehr >>
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