I'm pretty sure that United designed features that were unique to their own games (e.g., 8 balls next game), but did they ever introduce a feature that was later copied by Bally?
- plopping a ball in hole 16 for an extra ball ("Ballyhole")
- scoring the short diagonals.
I'm sure there's more. I added dates to the flyer tour pages at:
so you can use a couple browser windows and step thru the flyers chronologically to compare. Keep in mind that the design dates and mfg/release dates weren't always the same sequence, and I wouldn't be too confident when you're talking about a few months delta in the dates.
That's neat... I didn't realize that United originated the "Ballyhole." (I don't imagine United would have cared much for that name
Which Bally games used the short diagonals? Were they late games?