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发明名称
Sound arrester at the opening of sound-arresting room
摘要
申请公布号
US2233966(A)
申请公布日期
1941.03.04
申请号
US19400340607
申请日期
1940.06.14
申请人
MASAICHI TOMINAGA
发明人
TOMINAGA MASAICHI
分类号
E04B1/82
主分类号
E04B1/82
代理机构
代理人
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