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发明名称
Perfectionnements apportés aux appareils utilisables pour indiquer les pressions régnant dans les puits et pour des buts analogues
摘要
申请公布号
FR706909(A)
申请公布日期
1931.07.01
申请号
FRD706909
申请日期
1930.11.06
申请人
ANGLO-PERSIAN OIL COMPANY LIMITED
发明人
分类号
E21B47/06
主分类号
E21B47/06
代理机构
代理人
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地址
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