Tensioning device for a board for educational purposes,申请号US19610147020-传众专利搜索

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发明名称	Tensioning device for a board for educational purposes
摘要
申请公布号	US3142194(A)	申请公布日期	1964.07.28
申请号	US19610147020	申请日期	1961.10.23
申请人	WILSON & GARDEN LIMITED	发明人	GARDEN WILLIAM B.
分类号	F16H7/08;G09B1/24	主分类号	F16H7/08
代理机构		代理人
主权项
地址

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