Means for breaking down and dislodging rocky material,申请号US19400339384-传众专利搜索

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发明名称	Means for breaking down and dislodging rocky material
摘要
申请公布号	US2250137(A)	申请公布日期	1941.07.22
申请号	US19400339384	申请日期	1940.06.07
申请人	TOM SEAMAN	发明人	SEAMAN TOM
分类号	E21C37/04	主分类号	E21C37/04
代理机构		代理人
主权项
地址

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