This page displays all 「FI」 in main group E21B15/00. HB:Handbook CC:Concordance ReturnTo FI-Section/Broad-Facet-Choice Onelevelup E21B15/00 Supports for the drilling machine, e.g. derricks or masts [1,7] HB CC 2D129 E21B15/02 .specially adapted for underwater drilling (E21B 15/04 takes precedence) [2006.01] HB CC 2D129 E21B15/04 .specially adapted for directional drilling, e.g. slant hole rigs [3] HB CC 2D129 TOP
E21B15/00 Supports for the drilling machine, e.g. derricks or masts [1,7] HB CC 2D129 E21B15/02 .specially adapted for underwater drilling (E21B 15/04 takes precedence) [2006.01] HB CC 2D129 E21B15/04 .specially adapted for directional drilling, e.g. slant hole rigs [3] HB CC 2D129