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发明名称
Noise insulating ring for earphones
摘要
申请公布号
US2447470(A)
申请公布日期
1948.08.17
申请号
US19430514606
申请日期
1943.12.17
申请人
OXZYN COMPANY
发明人
VALENTINE JOSEPH E.
分类号
H04R1/10
主分类号
H04R1/10
代理机构
代理人
主权项
地址
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