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发明名称
Improvements in or relating to valves for pipings of all kinds, preferably preventertype valves for petroleum bore-holes
摘要
申请公布号
GB776306(A)
申请公布日期
1957.06.05
申请号
GB19550000225
申请日期
1955.01.04
申请人
SCHOENEBECKER BRUNNENFILTER G.M.B.H.
发明人
分类号
E21B33/06
主分类号
E21B33/06
代理机构
代理人
主权项
地址
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