Hard cutting

hard formation force

Hard head position

clean cutting formation

formation cutting

head formation

Leaf head formation

combined cone type cutting head

Cutting Head

high pressure waterjet cutting head

roller-type cutting head

Hard Roof and Hard Coal

Hard Roof and Hard Floor

Member 4 of Quantou Formation -Yaojia Formation

Trial cutting method for cutting machining

hammer head [= hammer head shark]

head to head configuration

head to head structure

(semi) hard process