发明名称 |
Telephone station signaling lock circuit |
摘要 |
A circuit which locks the signaling circuit of a telephone station. A microprocessor disconnects a keypad from an associated tone generator upon detection of operation of a lock button. The microprocessor connects the keypad to the tone generator upon detection of operation of the lock button and a predetermined unlock code provided by the keypad.
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申请公布号 |
US4453042(A) |
申请公布日期 |
1984.06.05 |
申请号 |
US19820452588 |
申请日期 |
1982.12.23 |
申请人 |
GTE AUTOMATIC ELECTRIC INC. |
发明人 |
WOLF, ANN L.;WAGONER, JOHN G. |
分类号 |
H04M1/673;(IPC1-7):H04M1/00 |
主分类号 |
H04M1/673 |
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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