Key bushing for rock-bit reamer pins,申请号US19290339623-传众专利搜索

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发明名称	Key bushing for rock-bit reamer pins
摘要
申请公布号	US1812681(A)	申请公布日期	1931.06.30
申请号	US19290339623	申请日期	1929.02.13
申请人	WALTER BRAUER	发明人	BRAUER WALTER
分类号	E21B10/30	主分类号	E21B10/30
代理机构		代理人
主权项
地址

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