telephone equipment
preferred label: telefonapparater @sv
preferred label: puhelinlaitteet @fi
type: Concept
related: telephone systems

communication systems
preferred label: dataöverföringssystem @sv
preferred label: tietoliikennejärjestelmät @fi
type: Concept
narrower: telephone systems

mobile phone systems
preferred label: matkapuhelinjärjestelmät @fi
preferred label: mobiltelefonsystem @sv
type: Concept
broader: telephone systems

telephone systems
type: Concept
narrower: mobile phone systems
in scheme: conceptscheme
preferred label: puhelinjärjestelmät @fi
preferred label: telefonsystem @sv
broader: communication systems
related: telephone equipment