• 专利标题: Chainless transmission unit of a bicycle
  • 申请号: US68599
    申请日: 1997-03-25
  • 公开(公告)号: USD401538S
    公开(公告)日: 1998-11-24
  • 设计人: Chen-Ching Chang
  • 申请人: Chen-Ching Chang
Chainless transmission unit of a bicycle
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