Motion picture projection screen,申请号US19300439963-传众专利搜索

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发明名称	Motion picture projection screen
摘要
申请公布号	US1834177(A)	申请公布日期	1931.12.01
申请号	US19300439963	申请日期	1930.03.29
申请人	BENJAMIN PETROWSKY	发明人	PETROWSKY BENJAMIN
分类号	G03B21/56	主分类号	G03B21/56
代理机构		代理人
主权项
地址

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