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发明名称
Improvements in or relating to sound-proof headpieces
摘要
申请公布号
GB524059(A)
申请公布日期
1940.07.29
申请号
GB19390002072
申请日期
1939.01.20
申请人
CHARLES WILLIAM GLOVER
发明人
分类号
H04R1/10
主分类号
H04R1/10
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