Method for strengthening the edges of loose leaf book sheets,申请号GB19380020413-传众专利搜索

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发明名称	Method for strengthening the edges of loose leaf book sheets
摘要
申请公布号	GB510990(A)	申请公布日期	1939.08.11
申请号	GB19380020413	申请日期	1938.07.09
申请人	WILLIAM WARREN TRIGGS	发明人
分类号	B42F3/00	主分类号	B42F3/00
代理机构		代理人
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地址

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