>>1778663Did some more research and there's another one from singapore, they're still researching it though and only have a handful of prototypes built, i.e. it's not in production anywhere
Since the concept is anything but new there's also been a couple dozen other friction drives throughout the years but most of them have been discontinued now or are way too expensive for what they offer
Basically
>>1778872 is one of the most advanced and viable portable friction drives around currently
