| 摘要 |
PROBLEM TO BE SOLVED: To distinguish specific individuals for sorting out and rejecting fraudulently distributed items and false brand items of fresh fish and stock farm products in a distribution process. SOLUTION: By driving nail-shaped magnetic devices or electromagnetic devices 2 into a few locations in fresh fish and stock farm products 1 to be specified, magnetism moves 4 from the north poles to the south poles via magnetic bodies 3, such as Fe and Mg that the fresh fish and stock farm products have inside their bodies, magnetized components in the blood, natural magnets (magnetite), etc. By these movements, a micro amount of magnetism remains in the magnetic bodies, even if the magnet devices are removed. Then by detecting the residual magnetism in the individuals by a magnetic sensor 4, it is determined whether the individuals are specific individuals in this distinguishing method.
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