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发明名称
Earphones for use with dictating machines and the like
摘要
申请公布号
US2780681(A)
申请公布日期
1957.02.05
申请号
US19540440608
申请日期
1954.07.01
申请人
DYNA-LABS, INC.
发明人
SHAPER HARRY B.
分类号
H04M1/05;H04R1/10
主分类号
H04M1/05
代理机构
代理人
主权项
地址
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