PURPOSE: To quickly obtain a history information at the time of manufacture of a package and to make the control of a large quantity of information possible.

CONSTITUTION: On a printed wiring board 1 on which electrical components 2 are mounted, a memory IC3, in which a history information at the time of mounting of these electrical components 2 is written, is mounted together with said electrical components via IC socket 4 so that control is performed according to the history information of this memory IC3.