The tractor uses our company unique fluctuation technology, the work is steady, the reliability is good, the force of traction is big.
牵引机采用我伺独特升降技术，工作平稳，可靠性好，牵引力大。
2
By simulation of the tractor in straight oil pipe with obstacle, discussed the working situation of components and the relation between drag force and the force need to cross obstacle.
The cash was carried by tractor-trailer trucks from the fortress-like Federal Reserve currency repository in East Rutherford, N. J. , to Andrews Air Force Base in Maryland, then flown to Baghdad. U.