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Internal hub transmission electric operation mechanism
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Clutch
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Internal speed changer and its control method
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Internal hub transmission operating mechanism
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Transmission device and internal speed changer and shifting control method based on planetary gear train
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Locking system and its lock and control method of application
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Lock assembly and lock and its locking control method comprising the lock assembly
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Rotary locking mechanism and its lock of application and locking control method
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Multi-gear transmission and center wheel pawl installation structure used in same
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Automatic inner speed changer of manual adjustment and automatic adjustment integrated bicycle, bicycle and speed change method
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Inner speed changer of bicycle
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