Sound absorbent translucent building block,申请号US19570694959-传众专利搜索

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发明名称	Sound absorbent translucent building block
摘要
申请公布号	US2975853(A)	申请公布日期	1961.03.21
申请号	US19570694959	申请日期	1957.11.07
申请人	FRIEND ALBERT W	发明人	FRIEND ALBERT W.
分类号	E04B1/74;E04B1/84;E04C1/42	主分类号	E04B1/74
代理机构		代理人
主权项
地址

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