Protector for oil well equipment,申请号US19470727826-传众专利搜索

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发明名称	Protector for oil well equipment
摘要
申请公布号	US2638169(A)	申请公布日期	1953.05.12
申请号	US19470727826	申请日期	1947.02.11
申请人	GRAY TOOL COMPANY	发明人	CRAIN ROBERT L.
分类号	E21B33/03;E21B34/02	主分类号	E21B33/03
代理机构		代理人
主权项
地址

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