Photometer for determining the time of exposure for photographic picture taking,申请号US19330686603-传众专利搜索

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发明名称	Photometer for determining the time of exposure for photographic picture taking
摘要
申请公布号	US1974492(A)	申请公布日期	1934.09.25
申请号	US19330686603	申请日期	1933.08.24
申请人	MAX HELFENSTEIN	发明人	HELFENSTEIN MAX
分类号	G01J1/22	主分类号	G01J1/22
代理机构		代理人
主权项
地址

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