and 6 years later, in the german stuttgart, the engineer and entrepreneur wilhelmfein set up mass productionion work. at the beginning, the gadget was two-handed and rather bulky. this was corrected by the american duncan black, he was inspired by the design of the popular colt pistol, from which he designed the first hand-held portable electric drill with one pistol grip . impact mechanism perforator. serves not only for drilling, but also for chiselling hard surfaces, if a miniature manual screwdriver. screws and self- tapping screws are easily screwed in, outwardly they differ, but they are based on the same design of the first australian electric drill, which was invented for mining miners and was developed by a swedish engineer. arthur james arno, he seriously simplified the construction work and of course changed the world. arthur james arnot, remember this name when you take an electric drill, next time in your hands, really, don’t this early in the morning. we are late in the evening, then you will be friends with your neighbors. well, now we will tell you a little about the turtle a