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发明名称
Cut-off valve for drill stems
摘要
申请公布号
US1908762(A)
申请公布日期
1933.05.16
申请号
US19310561138
申请日期
1931.09.04
申请人
JOHNSTON EDGAR C;FOWLER JR JOHN F
发明人
JOHNSTON EDGAR C.;JR. JOHN F. FOWLER,
分类号
E21B21/10;E21B47/024
主分类号
E21B21/10
代理机构
代理人
主权项
地址
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