Machinery is the entirety of the products of mechanical engineering. Mechanical engineering is one of the oldest engineering sciences. It is understood as a branch of industry as well as an engineering discipline. This field of activity includes the development, construction and production of machines and machine parts. As a branch of industry, mechanical engineering originated from the craft of metalworking by blacksmiths and locksmiths. As an engineering discipline according to modern understanding, it is based on a systematic scientific reference to physics, especially mechanics.