gsm
type: Concept
preferred label: GSM @fi
broader: mobile phone systems

IMT-2000
type: Concept
broader: mobile phone systems

UMTS
type: Concept
broader: mobile phone systems

NMT
type: Concept
broader: mobile phone systems

mobile phone systems
type: Concept
broader: telephone systems
preferred label: matkapuhelinjärjestelmät @fi
preferred label: mobiltelefonsystem @sv
narrower: NMT
narrower: IMT-2000
narrower: gsm
narrower: UMTS
in scheme: conceptscheme

telephone systems
type: Concept
preferred label: puhelinjärjestelmät @fi
preferred label: telefonsystem @sv
narrower: mobile phone systems