Directive transceiver for sound,申请号US19320639129-传众专利搜索

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发明名称	Directive transceiver for sound
摘要
申请公布号	US2406767(A)	申请公布日期	1946.09.03
申请号	US19320639129	申请日期	1932.10.22
申请人	HAYES HARVEY C	发明人	HAYES HARVEY C.
分类号	G01S1/72	主分类号	G01S1/72
代理机构		代理人
主权项
地址

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