Have 2 Rohloffs* and a Brompton with a BSR, (the AW3 made for the Brompton company)
with a Mountain drive 2 speed planetary Gear box crank . Chain does not shift..

Some similarity . Rohloff is 3_3speeds** and a Low range gear to use all 7 gears a second time
Mountain drive is using the 1 3 speed a second time .

*of the 2, The one in the Bike Friday with 20" wheels Is better able to be geared Lower , because of the smaller wheel size.

same 16t hub cog same gear range 26" wheel 38t chainring; 20" wheel 53t chainring.

** 3 x 3 speeds is 9 but 2 of them are redundant 2nd gears , leaving just one of the 3 , the 11th..( 4th, in low range)