In 1845, John Lyon of Harrisburg, Iowa, patented what is believed to be the first elevating grader. Dubbed the “Ditching Plow,” it was designed to excavate bank material and transfer it to a wagon ...
One of the most important concepts in the history of construction machinery is that modern equipment very often uses the same principles of design and operation as predecessors from 100 to nearly 200 ...
Some results have been hidden because they may be inaccessible to you
Show inaccessible results
Feedback