In the 1970s, most research was aimed at direct mechanical power transmission. (lowtechmagazine.com)
However for mechanical power; so far, no one has attempted any such device which can allow power flow from one component to other but can ensure that reverse power can not flow. (wardsauto.com)
One rotating molecule can spin other molecules attached to it, converting electricity into mechanical power, just like larger gears. (discovermagazine.com)