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| 11. | inspection and evaluation of petroleum construction engineering Telecommunication engineering (Toll open |
| 石油建设工程质量检验评定标准通信工程（长途通信明线载波电话安装工程) |
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| 12. | The test methods for 3-channel open wire carrier telephone equipment |
| GB/T4770.1-1984明线三路载波电话设备主要性能的测试方法 |
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| 13. | Immunity specification of open wire carrier system to the interference from the radio broadcasting and |
| GB/T7434-1987架空明线载波通信系统抗无线电广播和通信干扰的指标 |
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| 14. | open-wire 12-channel carrier telephone terminal equipment |
| 明线１２路晶体管载波电话终端机 |
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