| 摘要 |
PROBLEM TO BE SOLVED: To prevent an exterior part such as a wristwatch case, a backcover and a band from deteriorating in appearance, and causing offensive odor and an itch, by removing a deposited dirty substance. SOLUTION: A photocatayst film is provided in a surface of the exterior part of the wristwatch to remove the dirty substance deposited in the exterior part by receiving near ultraviolet rays.
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