Andy Howell did a switch board slide on one in 1281 by New Deal, which I think is 1991 ish, Mike Carroll probably did the first switch noselside in questionable, Creager and Frank Hirata went switch frontside in Super Conducter Collider, around 92-93, and I think the first switch 50-50 may have been Bobby Puleo in his 411 am part im guessing 1996, but there was also a dude from Portland name Scott Yamura that switch 50-50 rails pretty regularly that might have beat Bobby to it.