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If breaks down even a portion which is the earphone,
the user will discard it or buy new one.
But, if it is possible to replace a broken part with new one,
it is possible to prevent the resources that are discarded,
and users can use the earphone longer.
Gyeongbuk, Korea, South Korea
Gumi-si, South Korea
Gyeongsan, South Korea
Yeongnam Univ, Dae-dong
Chungcheongbuk-do, South Korea