A system for performing sequential operations on a can body, such as necking the open end of the can body, in which two or more machines, such as die necking machines are, are coupled by a transfer module. In the second placement step, the first separator is made to overlap the elastic member while first positioning members for positioning the elastic member are made to retract into the placement surface. This information may be retrieved using specific process steps and predetermined timing. In the method for making the stiffener, the stiffener is formed by being punched from the plate material 10. The third signal wiring pattern connects the first via conductor to the second via conductor.