| 发明名称 |
Mode switching and voltage regulator circuitry for a telephone answering device |
| 摘要 |
In a telephone answering device, a bistable circuit employing a single operational amplifier is used for mode switching.
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| 申请公布号 |
US4119801(A) |
申请公布日期 |
1978.10.10 |
| 申请号 |
US19750641551 |
申请日期 |
1975.12.17 |
| 申请人 |
JACOBSON, SAVA |
发明人 |
JACOBSON, SAVA |
| 分类号 |
H04M1/65;(IPC1-7):H04M1/65 |
主分类号 |
H04M1/65 |
| 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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