2. Cov khoom siv pneumatic zoo ua kom lub zog qis thiab siv cua thiab ua haujlwm siab.
3. Cov qauv yooj yim, centralized tswj mechanism, yooj yim rau kev khiav lag luam.
4. Lub teeb yuag, yooj yim installation thiab kev thauj mus los.
5. Cov ntsia hlau tshwj xeeb thiab tso tawm tshuab ntawm cov khoom siv lub raj txo qis kev siv zog.
6. Kev tsim tshwj xeeb rau kev taw qhia drilling.










