{"id":"S85051921","label":"Frequency changers","description":"","source_url":"https://id.loc.gov/authorities/subjects/sh85051921","normalized_label":"frequency changers","broader":["http://id.loc.gov/authorities/subjects/sh85041637","http://id.loc.gov/authorities/subjects/sh85041835"],"aliases":["Changers, Frequency","Converters, Frequency","Frequency converters"],"source_identifier":"http://id.loc.gov/authorities/subjects/sh85051921","provider":"lcsh","revision":"14739565e5394ceb","taxonomy_revision":"f050b5d4780b1289","title":"Frequency changers","url":"/topics/S85051921","kind":"topic-directory","aeo_cohort":"topic-directory","catalogue_revision":"f050b5d4780b1289","numeric_address":"864704614656786944","address_version":"morton4x16-v1","coordinates":[0,20,18216,17408],"answer_status":"Directory metadata; local answer requires separate source review","truth_status":"Subject descriptor, not a factual answer or a demonstrated knowledge gap","reviewed_answer":null}