他们受雇于拥有和经营重型装备的公司，重型装备经销商，租赁和服务机构，以及铁路运输企业和城市轨道交通系统。
They are employed by companies which own and operate heavy equipment, and by heavy equipment dealers, rental and service establishments, and railway transport companies and urban transit systems.
他们受雇于拥有和经营重型装备的公司，重型装备经销商，租赁和服务机构，以及铁路运输企业和城市轨道交通系统。
They are employed by companies which own and operate heavy equipment, and by heavy equipment dealers, rental and service establishments, and railway transport companies and urban transit systems.
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