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发明名称
Collapsible back-up ring
摘要
申请公布号
US2987022(A)
申请公布日期
1961.06.06
申请号
US19560612271
申请日期
1956.09.26
申请人
GRINNELL CORPORATION
发明人
THIELSCH HELMUT J.
分类号
B23K9/035
主分类号
B23K9/035
代理机构
代理人
主权项
地址
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