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Worry largest of bicycle users is a bicycle thief. A bicycle thief is a large issue even if you lock to a lock. Also, you are inconvenient for bicycle users carrying as a bicycle lock is heavy. IN LOCK is a bicycle being locked without a lock. A frame is the bicycle which is a lock. You can carry as separated with an electronic key after having locked a bicycle.
Sejong UNIV
Seoul, South Korea
Sejong UNIV
Seoul, South Korea
Sejong UNIV
Seoul, South Korea
songhee kim