https://w3id.org/framester/conceptnet5/data/en/public_address_system <https://w3id.org/framester/conceptnet5/schema/DerivedFrom> <https://w3id.org/framester/conceptnet5/data/en/public.a> <https://w3id.org/framester/conceptnet5/schema/IsA> <https://w3id.org/framester/conceptnet5/data/en/audio_system> risorse dalla linked data cloud