Mechanical Coupler- Lub Caij Nplooj Ntoos Hlav Caij Nplooj Ntoos Hlav, nws yog ib qho yooj yim tsim nrog kev saib xyuas qis dua.Ib qho yooj yim nruab, zoo meej haum nrog koj Excavator.Cov khoom siv muaj zog txhawb kev coupling ntau ruaj thiab siv lub neej ntev.