Swivel and feed connection for a core drill,申请号US19620216431-传众专利搜索

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发明名称	Swivel and feed connection for a core drill
摘要
申请公布号	US3204707(A)	申请公布日期	1965.09.07
申请号	US19620216431	申请日期	1962.08.13
申请人	JOHNSON BERT E	发明人	JOHNSON BERT E.
分类号	E21B21/02	主分类号	E21B21/02
代理机构		代理人
主权项
地址

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