Improvements in optical vibration-recording apparatus,申请号GB19290031057-传众专利搜索

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发明名称	Improvements in optical vibration-recording apparatus
摘要
申请公布号	GB343112(A)	申请公布日期	1931.02.12
申请号	GB19290031057	申请日期	1929.10.12
申请人	WILLIAM EWART WILLIAMS	发明人
分类号	G02B5/04	主分类号	G02B5/04
代理机构		代理人
主权项
地址

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