Thib Ob Tiam Excavator

Nrog rau kev siv tshuab hydraulic thoob plaws, excavators tau nruab nrog ntau cov khoom siv sib kis tau zoo, thiab hloov cov khoom siv sib txuas nrog hydraulic kis tau tus mob yog qhov loj tshaj plaws hauv kev siv tshuab excavator. Nyob rau hauv 1950, lub teb chaws Yelemees thawj hydraulic excavator tau yug los. Hydraulic mechanical kis tau tus mob yog qhov thib ob tiam excavator.