The Caterpillar 633 elevating scraper
The 1960s and 1970s were a very fertile time for machinery manufacturers with a worldwide boom in earthmoving projects, and the big manufacturers of the...
Tag : the 639D
The Caterpillar 639D elevating scraper
As in comedy, they say that timing is everything. Caterpillar introduced the model 639D just when the bottom was beginning to fall out of the...