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发明名称
Progressively collapsible mandrel
摘要
申请公布号
US2830552(A)
申请公布日期
1958.04.15
申请号
US19540411403
申请日期
1954.02.19
申请人
PARSONS CORPORATION
发明人
BALLAUER ALB C.
分类号
B23K3/08
主分类号
B23K3/08
代理机构
代理人
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