{"id":"S88000504","label":"Secondary surveillance radar","description":"","source_url":"https://id.loc.gov/authorities/subjects/sh88000504","normalized_label":"secondary surveillance radar","broader":["http://id.loc.gov/authorities/subjects/sh85110303"],"aliases":["Air traffic control radar beacon systems","Secondary radar"],"source_identifier":"http://id.loc.gov/authorities/subjects/sh88000504","provider":"lcsh","revision":"d4c263d4a81d175c","taxonomy_revision":"f050b5d4780b1289","title":"Secondary surveillance radar","url":"/topics/S88000504","kind":"topic-directory","aeo_cohort":"topic-directory","catalogue_revision":"f050b5d4780b1289","numeric_address":"14754988939974952516","address_version":"morton4x16-v1","coordinates":[0,20,64287,57344],"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}