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发明名称
Package spring group
摘要
申请公布号
US2813711(A)
申请公布日期
1957.11.19
申请号
US19540452333
申请日期
1954.08.26
申请人
AMERICAN STEEL FOUNDRIES
发明人
COTTRELL ROBERT B.
分类号
B61F5/12
主分类号
B61F5/12
代理机构
代理人
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