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经营范围
发明名称
Back circulating valve
摘要
申请公布号
US2863511(A)
申请公布日期
1958.12.09
申请号
US19550528585
申请日期
1955.08.16
申请人
JOHNSTON TESTERS, INC.
发明人
MOOSMAN JACK A.
分类号
E21B21/10;E21B34/06
主分类号
E21B21/10
代理机构
代理人
主权项
地址
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