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to phrases
telegrafia harmonica
commun.
audio frequency telegraphy
;
carrier telegraphy
;
tone frequency telegraphy
;
voice frequency telegraphy
telegrafia harmónica
commun., el.
voice-frequency multi-channel telegraphy
;
voice-frequency telegraphy
telegr.
voice-frequency multiplex telegraphy
telegrafia harmonica:
13 phrases
in 3 subjects
Communications
3
Electronics
9
Telegraphy
1
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