| 发明名称 |
TRANSMITTING ARRANGEMENT FOR USE IN TONE FREQUENCY PUSHBUTTON SELECTION SYSTEMS |
| 摘要 |
A transmitting arrangement for use in a tone frequency pushbutton selection system which by the depression of an arbitrary key a single tone frequency is produced by an oscillator coil and capacitor arrangement and depression of any two adjacent keys results in short circuiting a portion of the oscillator coil. |
| 申请公布号 |
US3648202(A) |
申请公布日期 |
1972.03.07 |
| 申请号 |
US19710126339 |
申请日期 |
1971.03.19 |
| 申请人 |
U.S. PHILIPS CORP. |
发明人 |
JAN SCHALKWIJK |
| 分类号 |
H04M1/50;(IPC1-7):H03J5/08;H03J5/32 |
主分类号 |
H04M1/50 |
| 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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