发明名称 |
Telephone handset attachment for use in-the-ear hearing aids |
摘要 |
An attachment for a telephone handset used by users of in-the-ear hearing aids including a cup shaped member which acoustically couples the handset to the ear and serves to cancel feedback between the hearing aid receiver and microphone.
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申请公布号 |
US4864611(A) |
申请公布日期 |
1989.09.05 |
申请号 |
US19870124973 |
申请日期 |
1987.11.24 |
申请人 |
HELMUTH, KELD T. |
发明人 |
HELMUTH, KELD T. |
分类号 |
H04M1/20;H04M1/247;H04R25/00 |
主分类号 |
H04M1/20 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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