Acoustic telegraphy (Q424090)
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various methods of transmitting more than one telegraph messages simultaneously
- harmonic telegraphy
| Language | Label | Description | Also known as |
|---|---|---|---|
| English | Acoustic telegraphy |
various methods of transmitting more than one telegraph messages simultaneously |
|
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Wikipedia(5 entries)
- cawiki Telegrafia harmònica
- dewiki Akustische Telegrafie
- enwiki Acoustic telegraphy
- eswiki Telegrafía armónica
- frwiki Télégraphie harmonique