{"id":"S85042239","label":"Electron tubes","description":"","source_url":"https://id.loc.gov/authorities/subjects/sh85042239","normalized_label":"electron tubes","broader":["http://id.loc.gov/authorities/subjects/sh85042254"],"aliases":["Electric valves","Valves, Electric"],"source_identifier":"http://id.loc.gov/authorities/subjects/sh85042239","provider":"lcsh","revision":"9ea2d68299497346","taxonomy_revision":"f050b5d4780b1289","title":"Electron tubes","url":"/topics/S85042239","kind":"topic-directory","aeo_cohort":"topic-directory","catalogue_revision":"f050b5d4780b1289","numeric_address":"10126497969722491392","address_version":"morton4x16-v1","coordinates":[0,20,18064,64512],"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}