| 发明名称 |
METHOD AND APPARATUS FOR INSTALLING TELEPHONE INTERCOM-VOICE MESSAGING APPARATUS AT DOORBELL FOR DWELLING |
| 摘要 |
A doorbell response system (19) can be retrofit in an existing doorbell system without requiring the incorporation of new wiring in the existing doorbell system.
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| 申请公布号 |
WO9820668(A1) |
申请公布日期 |
1998.05.14 |
| 申请号 |
WO1997US19734 |
申请日期 |
1997.10.29 |
| 申请人 |
STUART, JOHN, C. |
发明人 |
STUART, JOHN, C. |
| 分类号 |
H04M3/533;H04M9/00;H04M11/02;(IPC1-7):H04M7/10;H04M1/60;H04M7/14 |
主分类号 |
H04M3/533 |
| 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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