| 发明名称 |
System for selectively operable dual simultaneous siren broadcast from a single speaker |
| 摘要 |
A system for broadcasting two siren sounds simultaneously over a single speaker. This function is performed by adding or subtracting the signals.
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| 申请公布号 |
US4088995(A) |
申请公布日期 |
1978.05.09 |
| 申请号 |
US19770772067 |
申请日期 |
1977.02.25 |
| 申请人 |
INTERNATIONAL TELEPHONE AND TELEGRAPH CORPORATION |
发明人 |
PALADINO, C. ALFRED |
| 分类号 |
G08B3/10;G10H1/30;(IPC1-7):G08B3/00 |
主分类号 |
G08B3/10 |
| 代理机构 |
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代理人 |
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