Bifocal lens and method of making the same,申请号US19300475934-传众专利搜索

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发明名称	Bifocal lens and method of making the same
摘要
申请公布号	US1951506(A)	申请公布日期	1934.03.20
申请号	US19300475934	申请日期	1930.08.18
申请人	CONTINENTAL OPTICAL MANUFACTURING COMPANY	发明人	DUCKWALL FRANK E.
分类号	G02C7/06	主分类号	G02C7/06
代理机构		代理人
主权项
地址

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