Protector for drill pipes,申请号US19400360913-传众专利搜索

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法人/股东/高管

发明名称	Protector for drill pipes
摘要
申请公布号	US2308147(A)	申请公布日期	1943.01.12
申请号	US19400360913	申请日期	1940.10.12
申请人	PATTERSON-BALLAGH CORPORATION	发明人	BALLAGH JAMES C.
分类号	E21B17/10	主分类号	E21B17/10
代理机构		代理人
主权项
地址

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