History of the NO Hop Bar???

[Bernhard]

Does anyone know the history of the No Hop Bars used on GM A body cars?
We ran a set on our car in the early 80's.I think those were made by Mr Gasket.
I do remember that they were cast out of aluminum unlike all the other ones that I have seen, that were cast out of cast-iron.
I was wondering who made them first and what year they were introduced to the market place.
Thanks
Bernhard