[ETL]

"The first self-propelled grader was made in 1920 by the Russell Grader Manufacturing Company, which called it the Russell Motor Hi-Way Patrol. These early graders were created by adding the grader blade as an attachment to a generalist tractor unit.

After purchasing the company in 1928, Caterpillar went on to truly integrate the tractor and grader into one design—at the same time replacing crawler tracks with wheels to yield the first rubber-tire self-propelled grader, the Caterpillar Auto Patrol, released in 1931.[3]"

https://en.wikipedia.org/wiki/Grader#History

[ETL]

From my Wikipedia excerpt on Antimatter...

“There is considerable speculation as to why the observable universe is composed almost entirely of ordinary matter, as opposed to an equal mixture of matter and antimatter.

This asymmetry of matter and antimatter in the visible universe is one of the great unsolved problems in physics.[2]”