| 摘要 |
PROBLEM TO BE SOLVED: To provide a helmet with a spontaneously deodorizing function, capable of preventing bad smells from being formed, nor foul smells, even when repeatedly used for a long period. SOLUTION: This helmet is so structured that at least one member for composing the helmet contains a ceramic powder which contains a radiation-emitting uranium series nuclear species and/or thorium series nuclear species. The member preferably contains a tourmaline ore powder together with the ceramic powder. COPYRIGHT: (C)2005,JPO&NCIPI
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