Reversible coal cutting bit,申请号US19420427049-传众专利搜索

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发明名称	Reversible coal cutting bit
摘要
申请公布号	US2312538(A)	申请公布日期	1943.03.02
申请号	US19420427049	申请日期	1942.01.16
申请人	FORBES CHARLES J	发明人	FORBES CHARLES J.
分类号	E21C35/193	主分类号	E21C35/193
代理机构		代理人
主权项
地址

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