Hair Trimmer is operated by a pair of handles which are alternately squeezed together and released. Barbers used them to cut hair close and fast. The hair was picked up in locks and the head was rapidly depilated. Such haircuts became popular among boys, mostly in schools, and young men in the military and in prisons.
Manual Trimmer was invented between 1850 and 1890 by Nikola, a Serbian barber. While they were widely used in the distant past, the advent and reduction in the cost of electric hair Shaver have led to their largely replacing manual Shaver. Some barbers in Western countries continue to use them for trimming. They are also used in the Russian army: when conscripts enter boot camp, they cut their hair close to the skin, sometimes using manual Trimmer