ARM RING INCLUDING HARD CHARCOAL PARTICLE

摘要

PROBLEM TO BE SOLVED: To prevent hard charcoal particles from being exposed to the air and the water. SOLUTION: This arm ring 2 has a double structure, that is, the hard charcoal particles are mixed in a subject material of an inner layer 3, and an outer layer 4 is made out of only the subject material. COPYRIGHT: (C)2003,JPO