Self widening subgrade planers and testers,申请号US19570633042-传众专利搜索

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发明名称	Self widening subgrade planers and testers
摘要
申请公布号	US2965987(A)	申请公布日期	1960.12.27
申请号	US19570633042	申请日期	1957.01.08
申请人	THE HELTZEL STEEL FORM AND IRON CO.	发明人	GRAVES GORDON R.
分类号	E02F3/76	主分类号	E02F3/76
代理机构		代理人
主权项
地址

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