Book supporting apparatus,申请号US19340717931-传众专利搜索

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发明名称	Book supporting apparatus
摘要
申请公布号	US2019581(A)	申请公布日期	1935.11.05
申请号	US19340717931	申请日期	1934.03.29
申请人	PROBST GEORGE H	发明人	PROBST GEORGE H.
分类号	A47B23/04	主分类号	A47B23/04
代理机构		代理人
主权项
地址

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