Studio for acoustic purposes,申请号US19290413538-传众专利搜索

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发明名称	Studio for acoustic purposes
摘要
申请公布号	US1853912(A)	申请公布日期	1932.04.12
申请号	US19290413538	申请日期	1929.12.12
申请人	BELL TELEPHONE LABORATORIES, INCORPORATED	发明人	MACNAIR WALTER A.
分类号	E04B1/82;E04B1/99	主分类号	E04B1/82
代理机构		代理人
主权项
地址

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