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摘要
申请公布号
US3340721(A)
申请公布日期
1967.09.12
申请号
US19640409525
申请日期
1964.11.06
申请人
SALT DOUGLAS F
发明人
SALT DOUGLAS F.
分类号
B21D11/08
主分类号
B21D11/08
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