| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem that a conventional oil filter used for removing iron in automobile engine oil, or the like, has a small magnet inside which is weak in the magnetic ability, disposable and not economical. SOLUTION: This apparatus is structured by mounting a detachable magnet on the outside of the oil filter. The detachable magnet is, for example, a soft magnet. COPYRIGHT: (C)2006,JPO&NCIPI
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