RECTANGULAR DRILLING FOR EARTH EXCAVATION,申请号USD3612193-传众专利搜索

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发明名称	RECTANGULAR DRILLING FOR EARTH EXCAVATION
摘要
申请公布号	US3612193(A)	申请公布日期	1971.10.12
申请号	USD3612193	申请日期	1969.08.11
申请人	KAJIMA KENSETSU KK.	发明人	SHIGERU HIRATA
分类号	E02F3/92;E21B7/00;E21B21/00;(IPC1-7):E21B11/00	主分类号	E02F3/92
代理机构		代理人
主权项
地址

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