hat
Plug-in kalite pyès casted en Marine: ɸ, 7,,- 5 ɸ150 (pou espesyal forage operasyon de forages drenaj gaz nan la kouti chabon)
eng
Plug-in type of casted steel spiral bits:ɸ75-ɸ150 (For special drilling operation of gas drainage boreholes in the coal seam)