Tool joint for rotary drills,申请号US19300420419-传众专利搜索

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发明名称	Tool joint for rotary drills
摘要
申请公布号	US1938255(A)	申请公布日期	1933.12.05
申请号	US19300420419	申请日期	1930.01.13
申请人	HINDERLITER FRANK J	发明人	HINDERLITER FRANK J.
分类号	E21B17/042;F16L15/04	主分类号	E21B17/042
代理机构		代理人
主权项
地址

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