Based on the achievements obtained. the theoretic formula that determine the rut size of the caterpillar tractor and the friction drag coefficient of motion was deduced.

笔者将在此基础上．推导出履带式拖拉机的车辙大小的理论公式及其沿疏松土地行走时的运动阻力系数。

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Photoelastic stress analysis proves reliable line contact simulation of samples for gear style contact fatigue parts designed by Caterpillar Tractor Co. , USA.

用光弹性应力分析，论证了美国卡特皮勒拖拉机公司的齿轮类线接触疲劳试样具有可靠的线接触模拟性；

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Holt, whose great-grandfather invented the first track-type tractor (which led to the formation of Caterpillar (nyse: CAT - news - people )), came to the rescue in 1996.

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Google sells at a lower price-earnings ratio than Union Pacific or Caterpillar Tractor.

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Holt, whose great-grandfather invented the first track-type tractor (which led to the formation of Caterpillar), came to the rescue in 1996.

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