Nova Expositions, just one name the Sanders family used for their show at different times/locations. I think the other was Penn Valley?
They went out of business in the early 90s, carried some big iron like a Flitzer (one of Reithoffers now), the B.Kurve (swiss bobs), F&B Scooters, Wave Swinger (now belongs to AofA), Sky Wheel, Skyliner, and host of other rides.
If you do a search on the forum there are still some stories out there about them I believe.