Means for indicating and cementing off leaks in well casings,申请号US19290366250-传众专利搜索

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发明名称	Means for indicating and cementing off leaks in well casings
摘要
申请公布号	US1812944(A)	申请公布日期	1931.07.07
申请号	US19290366250	申请日期	1929.05.27
申请人	GRANGER PAUL H	发明人	GRANGER PAUL H.
分类号	E21B33/134;E21B47/10	主分类号	E21B33/134
代理机构		代理人
主权项
地址

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