| 发明名称 |
Digitally activated coin control circuit |
| 摘要 |
A digitally activated coin control circuit for use in combination with a digitally activated ringing circuit for common manipulation of a prepaid coin station by a central processing unit of a telephone switching center to collect and alternatively to refund deposited coins.
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| 申请公布号 |
US4243841(A) |
申请公布日期 |
1981.01.06 |
| 申请号 |
US19790078414 |
申请日期 |
1979.09.24 |
| 申请人 |
GTE AUTOMATIC ELECTRIC LABORATORIES INCORPORATED |
发明人 |
YOUNG, JOHN S. |
| 分类号 |
H04M17/02;(IPC1-7):H04M17/00 |
主分类号 |
H04M17/02 |
| 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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