e/Neutral direct-current telegraph system

Information
has gloss	eng: In telecommunication, a neutral direct-current telegraph system (single-current system, single-current transmission system, single-Morse system) is a telegraph system in which (a) current flows during marking intervals and no current flows during spacing intervals for the transmission of signals over a line, and (b) the direction of current flow is immaterial.
lexicalization	eng: Neutral direct current telegraph system
lexicalization	eng: Neutral direct-current telegraph system
lexicalization	eng: Neutral directcurrent telegraph system
instance of	(noun) communicating at a distance by electric transmission over wire telegraphy