135775 ⎘
Cutting machines, i.e. for making slits approximately parallel or perpendicular to the seam Machines slitting solely by one or more reciprocating sawing implements or reciprocating cutter chains; Shaker conveyors with cutting means
Vibrating type hard rock cutting mechanism with function of directional high-speed abrasive jet advanced slitting
#2Forming oriented fissures in a subterranean target zone
#3Method and apparatus for creating a planar cavern
#4Drilling and opening reservoirs using an oriented fissure