The best multi tools ever invented are Engraved Leatherman Tools. They are known worldwide, and it seems like they have been around for at least a century. But, in fact, the company was founded only in 1983.
Tim Leatherman, the founder, developed the first tool in the late 1970’s. He was on a road trip across Europe, and decided he needed a tool kit that included pliers, a knife, file, screw drivers, and some other items. As usual, necessity is the mother of invention. This lead to his 1980 patent on the multi tool concept..
Still made in the USA out of top quality steel.