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发明名称
摘要
申请公布号	US1807780(A)	申请公布日期	1931.06.02
申请号	USD1807780	申请日期
申请人		发明人
分类号	E01D15/08	主分类号	E01D15/08
代理机构		代理人
主权项
地址

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