(1) Who ran the first two-stage turbocharged tractor in sled pulling?
(2) Better yet, what kind of tractor and what year was it (Hint: it was a pivotal year in American tractor pulling for various other reasons as well)?
(3) Which innovator/engineer greatly contributed to why the Internationals were the tractors to beat throughout the 1970s? (Namely the 1466)
(4) Who pioneered the first water injection system for two-stage turbocharged tractors (diesel, of course)?
(5) Who debuted the first turbine-engined tractor in 1974?