Hmm ,the single point height adjuster an Aussie invention , I've traced that back to 1947.(filed date)
George W Daggett, Meadville Pennsylvania , USA
I have wondered if the first Australians invented the boomerang by trial and error or could it be possible to find a piece of wood roughly the right shape to begin with, possibly a piece of drift wood that split in half ,did someone just pick up a stick and it flew in the air when it was thrown?,who really knows? The boomerang was certainly improved over many years..
Yes most kids tried the flying arm trick out the car window.
I think I have a copy of the Yazoo patent showing that metal cup.
