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摘要
申请公布号
US1800005(A)
申请公布日期
1931.04.07
申请号
US19270235283
申请日期
1927.11.23
申请人
STEEL AND TUBES, INC.
发明人
BRAUN CARL A.
分类号
B23D25/04
主分类号
B23D25/04
代理机构
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