Well signaling system,申请号US19420463774-传众专利搜索

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发明名称	Well signaling system
摘要
申请公布号	US2354887(A)	申请公布日期	1944.08.01
申请号	US19420463774	申请日期	1942.10.29
申请人	STANOLIND OIL AND GAS COMPANY	发明人	SILVERMAN DANIEL;FEARON ROBERT E.
分类号	E21B47/12	主分类号	E21B47/12
代理机构		代理人
主权项
地址

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