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发明名称
Tight center bar
摘要
申请公布号
US1799380(A)
申请公布日期
1931.04.07
申请号
US19290349567
申请日期
1929.03.25
申请人
MCKENNA PROCESS COMPANY OF ILLINOIS
发明人
LANGFORD GEORGE
分类号
E01B11/08
主分类号
E01B11/08
代理机构
代理人
主权项
地址
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