Never been built. Probably won't be either (unless I build it). All R&D into combustion engines has dropped to zero. It's all electric vehicles now. I just thought it was a neat design because it allows crazy amounts of gear ratios with very few parts. If you add three more gears you can get up to 24 speeds, three more after that gets you to 35 speeds. Even in 24 speed configuration it's far less parts than a traditional 8 speed automatic.
It also allows very high gear ratios. Normally you'd be limited to the transmission case size for the steepest gear ratio. If you have 20" to work with, you can only fit say a 25 tooth and a 90 tooth for a ratio of 4:1. That's all you can do because you physically can't fit larger gears with more teeth into that transmission case. With this transmission you engage forward on one half, and reverse on the other half and you can achieve very high ratios in a small transmission case size. 500:1 (or even higher) is no problem.

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