In twentieth Century 20, with the car, rolling bearing

      In twentieth Century 20, with the car, rolling bearing, miniature motor and the sewing machine industry development, automatic line started in mechanical manufacturing, the earliest is the combined machine tool automatic line. In twentieth Century before the 20's, the first is the production line and automatic production lines appear in the automotive industry, then become automatic line. After the Second World War, in the industrialized countries in mechanical manufacturing industry, the sharp increase of number of automatic line.