I kind of had an idea what this process might be, but looked it up.
The King road drag (also known as the Missouri road drag and split log road drag) was an implement for grading dirt roads that revolutionized the maintenance of dirt roads in the early 1900s, the early days of automobiles.
It was invented by David Ward King, who had a farm in Maitland, Missouri.
More to Come. --RoadDog