| 摘要 |
<p>PROBLEM TO BE SOLVED: To allow anyone to easily and instantaneously judge the exchange period or adjustment period of each kind of part to be used for a product or an industrial machine or the like, to certify the validity of the exchange period or the adjustment period to a third person all the time, and to certify the owner of not only the part but also the product or the industrial machine at the present time for clarifying who should take responsibility. SOLUTION: A history control medium 1 is provided with a data inputting and outputting part 2 with which a data reading probe 4 of a data reading device 3 can be brought into contact or connected, and a storage part for writing prescribed history data by using a power supplied from the data reading probe 4 when access codes through the data reading device 3 are coincident.</p> |
