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发明名称
Block guard
摘要
申请公布号
US1933011(A)
申请公布日期
1933.10.31
申请号
US19310523757
申请日期
1931.03.19
申请人
OIL WELL SUPPLY COMPANY
发明人
GREVE EDGAR E.
分类号
B66D3/04;B66D3/06
主分类号
B66D3/04
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代理人
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