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经营范围
发明名称
Contraction joint
摘要
申请公布号
US2278023(A)
申请公布日期
1942.03.31
申请号
US19400347125
申请日期
1940.07.24
申请人
ROBERTSON ROBERT R
发明人
ROBERTSON ROBERT R.
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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