On: Fist-sized 11M-to-1 gearbox

[Kenji]

No, it cannot. As you can see in this video from the site where he explains the mechanism:

https://www.youtube.com/embed/vbU1afvCRwc?version=3&rel=1&fs...

When he tries to move the red ring against the green ring (at 2:39), the thing doesn't budge. The gearbox concatenates two such transmissions, therefore, it cannot be operated backwards.