IMPROVEMENTS IN AND RELATING TO ACTIVE SOUND ATTENUATION,申请号ZA19770001689-传众专利搜索

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发明名称	IMPROVEMENTS IN AND RELATING TO ACTIVE SOUND ATTENUATION
摘要
申请公布号	ZA7701689(B)	申请公布日期	1978.02.22
申请号	ZA19770001689	申请日期	1977.03.21
申请人	SOUND ATTENUATORS LTD	发明人	SMITH R;CHAPLIN G
分类号	G10L;H04B	主分类号	G10L
代理机构		代理人
主权项
地址

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