The method was applied to analyze first tractor failure data.

并将该方法应用于拖拉机首次故障数据的分析。

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They've been there since the 1930s, when the first tractor arrived.

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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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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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