发明名称 |
Telephone interface-test device |
摘要 |
A telephone-telephone line tester wherein a telephone line serving a user is selectively coupled and uncoupled to either or both an audio amplifier or a user's telephone circuit whereby telephone user difficulties may be readily determined as between the telephone line or user's circuit and equipment.
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申请公布号 |
US4581494(A) |
申请公布日期 |
1986.04.08 |
申请号 |
US19840658813 |
申请日期 |
1984.10.09 |
申请人 |
MAYBERRY, JAMES A.;PICKENS, HERMAN L.;COOLEY WILLIAM E. |
发明人 |
PICKENS, HERMAN L. |
分类号 |
H04M1/24;H04M3/30;(IPC1-7):H04B3/46 |
主分类号 |
H04M1/24 |
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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