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发明名称
Expanding bar
摘要
申请公布号
US1858378(A)
申请公布日期
1932.05.17
申请号
US19270204965
申请日期
1927.07.11
申请人
WALTER SNODGRASS BENJAMIN
发明人
SNODGRASS BENJAMIN WALTER
分类号
E21C37/04
主分类号
E21C37/04
代理机构
代理人
主权项
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