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| 51. | ETS (Electronic Telegraph System) |
| 电报系统 |
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| 52. | Telegraph Convention |
| 电报公约 |
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| 53. | telegraph discriminator |
| 电报鉴频器 |
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| 54. | alphabetic telegraphy |
| 字母电报 |
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| 55. | telegraph multiplex |
| 电报复用 |
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| 56. | public telegraph |
| 公众电报 |
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| 57. | telegraph relay |
| 电报继电器 |
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| 58. | an echo telegraph |
| 回波电报 |
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| 59. | telegraph termina |
| 电报终端 |
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| 60. | acoustical telegraphy |
| 声频电报 |
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