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发明名称
Traveling block
摘要
申请公布号
US1796251(A)
申请公布日期
1931.03.10
申请号
US19290339625
申请日期
1929.02.13
申请人
OIL WELL SUPPLY COMPANY
发明人
GREVE EDGAR E.
分类号
B66D3/06
主分类号
B66D3/06
代理机构
代理人
主权项
地址
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