Contractible boring head for mining machines,申请号US19540475649-传众专利搜索

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发明名称	Contractible boring head for mining machines
摘要
申请公布号	US2745650(A)	申请公布日期	1956.05.15
申请号	US19540475649	申请日期	1954.12.16
申请人	GOODMAN MANUFACTURING COMPANY	发明人	SMITH HERMAN E.
分类号	E21C27/22	主分类号	E21C27/22
代理机构		代理人
主权项
地址

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