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发明名称
Spring dowel
摘要
申请公布号
US2231488(A)
申请公布日期
1941.02.11
申请号
US19370180290
申请日期
1937.12.17
申请人
YEOMAN RAY C
发明人
YEOMAN RAY C.
分类号
E01C11/14
主分类号
E01C11/14
代理机构
代理人
主权项
地址
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