Real world article
(written from a production point of view)
The Star Trek Pinball machine was created by Data East in 1991 for the series' 25th Anniversary. The machine's artwork prominently featured the main characters of Star Trek: The Original Series. And although the promotional flyer for the game mentions "Custom Digitized Speech from Scotty and Bones", there is no official reference to these being the actual voices of either James Doohan or DeForest Kelley.
Backglass from the machine
Star Trek Pinball cabinet
Star Trek Pinball playfield