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发明名称
Spring group
摘要
申请公布号
US2398700(A)
申请公布日期
1946.04.16
申请号
US19430473293
申请日期
1943.01.23
申请人
AMERICAN STEEL FOUNDRIES
发明人
EDSTROM CARL A.
分类号
B61F5/12
主分类号
B61F5/12
代理机构
代理人
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