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однополюсное телеграфирование stresses
amer.	single-current transmission
commun.	continuous wave telegraphy; single-current signalling
el.	on-off telegraph; single-current signaling
media.	neutral direct-current telegraph system (ток протекает только во время посылки); single-current system
tech.	on-off telegraphy
telecom.	single-pole telegraphy

однополюсное телеграфирование: 3 phrases in 3 subjects

Mass media	1
Technology	1
Telecommunications	1