Bearing for rock bits,申请号US19420460202-传众专利搜索

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发明名称	Bearing for rock bits
摘要
申请公布号	US2351357(A)	申请公布日期	1944.06.13
申请号	US19420460202	申请日期	1942.09.30
申请人	CHICAGO PNEUMATIC TOOL COMPANY	发明人	MILLER EDWARD L.;BROWN ROBINSON W.
分类号	E21B10/22	主分类号	E21B10/22
代理机构		代理人
主权项
地址

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