optical storage devices
type: Concept
narrower: videodisc recording

videodisc recording
type: Concept
narrower: compact discs
broader: video recording
broader: television
broader: optical storage devices

compact discs
type: Concept
broader: videodisc recording

video recording
type: Concept
narrower: videodisc recording

television
type: Concept
narrower: videodisc recording

concepts
type: Collection
type: ConceptGroup
member: videodisc recording