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发明名称
Spring group
摘要
申请公布号
US2356742(A)
申请公布日期
1944.08.29
申请号
US19410407704
申请日期
1941.08.21
申请人
AMERICAN STEEL FOUNDRIES
发明人
BACHMAN FRED E.
分类号
B61F5/12
主分类号
B61F5/12
代理机构
代理人
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