Bidhaa

Maelezo ya jumla

Chuanshanjia wameendeleza bidhaa, kama vile U-Drill, Spade Drill, Crown Drill (nafasi ya kuchimba visima), doa U-Drill, mchanganyiko wa kuchimba, VMD kubwa kuchimba, kuchimba visima, chombo cha boring, chombo cha kushikilia chana ya mafuta, zana ya boring, nk.