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HDX abbr.
abbr., auto.	high de luxe
HDX abbr.
abbr., automat.	half-duplex transmission
abbr., comp., net., IT	Half Done Xconnect
abbr., el.	Harris digital exchange
abbr., file.ext.	Help index (AutoCAD - Zortech C++)
abbr., IT	Help index
abbr., med.	hand-held dental X-ray (vlad-and-slav)
abbr., mil.	Half Duplex
tech.	half duplex circuit; half duplex operation; half duplex transmission
telecom.	Half-Duplex