| 发明名称 |
Telephone line access apparatus |
| 摘要 |
A telephone line access apparatus includes a first stage for providing high voltage protection and a second stage filter in series with the first stage. The first and second stages are incorporated within a housing that is adapted to plug into an existing main distribution frame of a telephone central office.
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| 申请公布号 |
US4782480(A) |
申请公布日期 |
1988.11.01 |
| 申请号 |
US19850799522 |
申请日期 |
1985.11.19 |
| 申请人 |
ALCATEL USA, CORP. |
发明人 |
HARGRAVE, FRANKLIN;MIDDLETON, FRANCISCO A.;ZELLER, JR., DAVID A. |
| 分类号 |
H03H9/54;H03H9/60;H04M3/00;H04M3/18;H04M11/06;H04Q1/14;(IPC1-7):H04J1/14 |
主分类号 |
H03H9/54 |
| 代理机构 |
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代理人 |
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