发明名称 |
CONTROL CIRCUIT FOR AN ELECTRICAL TELEPHONE ACCESSORY |
摘要 |
A control circuit for an electrical telephone accessory detects if the telephone receiver is on the cradle, the telephone ringer is actuated, or if the telephone receiver is lifted from the cradle. The control circuit connects the electrical telephone accessory to a power supply source when the telephone ringer is actuated or when the telephone receiver is lifted from the cradle.
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申请公布号 |
CA2052854(A1) |
申请公布日期 |
1992.06.19 |
申请号 |
CA19912052854 |
申请日期 |
1991.10.07 |
申请人 |
SANGARA INDUSTRIAL CO., LTD. |
发明人 |
LEE, PAUL |
分类号 |
H04M1/82;H04M19/04;(IPC1-7):H04M1/00 |
主分类号 |
H04M1/82 |
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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