Uses: metal plate cam on characters, such as change of parameters: type, date, lot number, serial number, serial number, and so on. Typical application: applicable to all factories, equipment and steel distribution sectors of production machines, such as signs. Uses: metal plate cam on characters, such as change of parameters: type, date, lot number, serial number, serial number, and so on. Typical application: applicable to all factories, equipment and steel distribution sectors of production machines, such as signs.