发明名称 |
COMMUNICATIONS SYSTEM FOR ALPHANUMERIC INFORMATION EMPLOYING AUDIO TONE SIGNALLING |
摘要 |
A communications system for exchanging alphanumeric information between remote stations, employing station apparatus (e.g., modified typewriters) capable of generating and responding to an audio tone code. The system is compatible with use of a push-button telephone instrument as an alternative sending station.
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申请公布号 |
US3675513(A) |
申请公布日期 |
1972.07.11 |
申请号 |
USD3675513 |
申请日期 |
1970.07.24 |
申请人 |
BELL TELEPHONE LAB. INC. |
发明人 |
JAMES LOTON FLANAGAN;JAMES HUGHES KRONMEYER;JOHN RICHARD NELSON |
分类号 |
H04M11/06;(IPC1-7):H04M11/00 |
主分类号 |
H04M11/06 |
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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