The "Universal Nut Sheller" is a device designed to make shelling peanuts less onerous for those who rely on the legumes for a large portion of their food needs. The simple device is a concrete cone inside a larger concrete cone, with a gap large enough to let shelled peanuts through whole while still removing the shells. The nuts and crushed shells are then sorted by hand.
The UNS was invented by American Jock Brandis, who according to AfriGadget, "was on a trip to Mali and saw some women who had been shelling peanuts leaving them with bleeding hands."
Fighting Hunger, One Village at a Time [Afrigadget.com]