Had the pleasure of visiting the Mechanical Museum a year back.  Sure enough, old Marvin was walking the floor doing odd jobs the entire time I was there.  The guy takes pride in the whole place, but the pinball machines are extremely well-kept.  The lineup, when I was there, covered at least one game from every decade, 1960-present.  The current lineup includes: TAF, Tron, Transformers, Buckaroo, El Dorado, Elvis, Family Guy, Funhouse, LOTR, Metallica, Star Trek Premium, TSPP and ToM.