It must be of a bulldozer operator. confronted by a dilapidated building, he can say: hi buddy, I need to euthanize you.

That changed in 1958 when Jerry Crew, a bulldozer operator working in Humboldt County, California, made casts of the bizarre footprints he had found.

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.