| русский | rus-000 |
| тональная телеграфия | |
| English | eng-000 | harmonic telegraphy |
| English | eng-000 | tone telegraph |
| English | eng-000 | tone telegraphy |
| English | eng-000 | voice-frequency |
| English | eng-000 | voice-frequency telegraph |
| English | eng-000 | voice-frequency telegraphy |