That changed in 1958 when Jerry Crew, a bulldozer operator working in Humboldt County, California, made casts of the bizarre footprints he had found.
情况到1958年发生了变化，在加利福尼亚州洪堡县开推土机的杰里·克鲁发现了一些奇怪的脚印，并制作了石膏模型。
This paper briefly describes the design of operator cabin of brick type of bulldozer, and discusses the improvement measures of main part of cabin and ceiling.
对积木式推土机驾驶室设计作了简单介绍。论述了驾驶室主体和顶棚的改进措施。
This paper briefly describes the design of operator cabin of brick type of bulldozer, and discusses the improvement measures of main part of cabin and ceiling.
对积木式推土机驾驶室设计作了简单介绍。论述了驾驶室主体和顶棚的改进措施。
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