building audio communications systems
type: Concept
broader: building communication services
narrower: staff location and call systems
narrower: public address systems
narrower: pneumatic tube systems
narrower: paging systems
narrower: intercom

building communication services
type: Concept
narrower: building audio communications systems

concepts
type: Collection
type: ConceptGroup
member: building audio communications systems

intercom
type: Concept
broader: building audio communications systems

paging systems
type: Concept
broader: building audio communications systems

pneumatic tube systems
type: Concept
broader: building audio communications systems

public address systems
type: Concept
broader: building audio communications systems

staff location and call systems
type: Concept
broader: building audio communications systems