First jump cue was Sammy Jones, married to Lorrie Jon at the time. He simply used a shaft to jump the cue ball.
First phenolic tip on a break cue? Mike Gulassay. There may have been some some attempts before, but his Sledghammer was the first available production break cue, as far as I know.
All the best,
WW
I live in Greenville and this is story as far as i'm concerned. I have a jump cue made for me by Harry Richards in '96 that now has a Gulyassy shaft and phenolic tip.