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| Standard Code | Standard Title | Standard Class | Order |
|---|---|---|---|
| GB/T 7625-1987 |
2400/1200 bits per second modem standardized for use in the general switched telephone network 在电话自动交换网上使用的标准化 2400/1200比特/秒调制解调器 |
China National Standards 2400 1200 bits |
 English PDF |
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