The history of multi-purpose folding knives begins in the XIX century with the army knives of various armies of the world. In 1891, the Swiss company Victorinox received the first state military contract for the production of folding multitool knives. Initially, multi-purpose knives were intended for opening cans and assembling and disassembling weapons. The first model of such a knife from Victorinox Model 1890 had a knife blade, a can opener, an awl, and a screwdriver as part of the tool. Then, as the army structure changed, the number and purpose of the tools also changed. Used in multitool army knives of different countries, the hook for cleaning the horse’s hooves began to gradually disappear from the tool range. At the same time, there was a second additional, shorter blade designed for sharpening pencils, as well as a corkscrew. Then began a significant increase in the number of tools and built-in scissors, a bottle opener, a small saw, tweezers, and others appeared. In the most modern versions of folding knives, you can find a flash drive, laser pointers, flashlights, compasses, etc. In addition, there are specialized multi-purpose knives for rescuers, fishermen, hunters, etc. Despite the appearance of multitools, which had two handles connected with pliers and often a larger number of tools, multifunctional knives continue to maintain their positions and are popular with consumers.