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1981年我场进口一种美国卡麦克公司生产的带激光控制装置的305B牵引式铲运机,经一年多的使用,效果很好。激光平地自动控制装置工作示意如图一。
In 1981, I imported a 305C trailed scraper with laser control device manufactured by Carmichael Company in the United States. After more than one year of operation, the effect was very good. Laser flat ground automatic control device work shown in Figure one.