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发明名称
Apparatus for forming metallic ring members
摘要
申请公布号
US3263477(A)
申请公布日期
1966.08.02
申请号
US19650453559
申请日期
1965.04.28
申请人
WALLACE EXPANDING MACHINES, INC.
发明人
ROPER RALPH E.
分类号
B21D53/30
主分类号
B21D53/30
代理机构
代理人
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