我公司自1991年起开始生产飞机牵引车，至今已生产各种型号的军用和民用飞机牵引车数百辆。
Since 1991, our company began producing Aircraft Hauling Tractor, has been producing hundreds of various types military and civilian Aircraft Hauling Tractor.
风县银母寺铅锌矿于1986年开始筹建，1990年投产，设计服务年限19年，至今已生产11年。
The mine of Yinmusi Lead-zinc in Fengxian started construction in 1986, the 1990 production, design service life of 19 years, has produced 11.
真空集热管从规模化生产至今已有近20年时间，产品结构、工艺、设备已很成熟，热性能指标的提高已非常难。
The production has been nearly 20 years from the time scale of vacuum tube, product structure, process and equipment has been very mature, the thermal performance of the already very difficult.
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