Hollow drill assembly,申请号US19470754733-传众专利搜索

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发明名称	Hollow drill assembly
摘要
申请公布号	US2626667(A)	申请公布日期	1953.01.27
申请号	US19470754733	申请日期	1947.06.14
申请人	HARRIS-SEYBOLD COMPANY	发明人	SPILLER WILLIAM R.
分类号	B23B31/20;B28D1/04	主分类号	B23B31/20
代理机构		代理人
主权项
地址

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