| 摘要 |
A computer ( 10 ) of a material supply company calculates a sales price of a material according to a state of production of a product, which is produced using a material supplied from the material supply company, and informs a computer ( 30 ) of a result of the calculation. The state of production of the product is measured by a measurement apparatus ( 32 ), and a result of the measurement is sent to the computer ( 10 ).
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