[QUOTE=downunder;12760206]This all goes back to history and the problems with patents but as far as model engines go Super Tigre first used their (patented) TST porting in 1959 with their G.20/15V "Jubilee" for CL speed and was so successful that Bill Wisniewski (a competitor in 1960) asked ST for permission to use their porting for an engine of his own design. I won't go into the details of the shenanigans used by the Italian team to "win" the '60 world championships but the outcome was that ST refused to let him use their TST porting. BW then spent a few years trying to develop a different porting system which eventuated into a Schneurle ported engine (the 1964 K&B 15RS (WART) engine) when BW won the world championship.
AFAIK the Enya 61X was the first production engine to use Schneurle porting in about 1977.[/QUOTE]
I am certain that OS's 40 SR ( rear induction racing engine ) of 1973 was OS's first Schneurle ported engine and I think ( perhaps not incidentally ) coincided with their introduction of CNC machines.