BUTTON-TYPE INPUT DEVICE WITH INDICATOR FUNCTION AND PORTABLE ELECTRONIC DEVICE INCORPORATING ABOVE INPUT DEVICE von CHOI CHANG-KIU, JANG KHONG-SEOK, KHVANG KVANG-IL, JIM JIL-MIUNG, JOO BIUNG-IN, KIM SEONG-VOON, KHONG SUN-GI, KIM NAM-VOO, KIM JEUN-BAE, PARK DZUN-KHO

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