{"id":"S85137180","label":"Traveling-wave tubes","description":"","source_url":"https://id.loc.gov/authorities/subjects/sh85137180","normalized_label":"traveling-wave tubes","broader":["http://id.loc.gov/authorities/subjects/sh85004651","http://id.loc.gov/authorities/subjects/sh85084973"],"aliases":[],"source_identifier":"http://id.loc.gov/authorities/subjects/sh85137180","provider":"lcsh","revision":"eb24f4ad26365435","taxonomy_revision":"f050b5d4780b1289","title":"Traveling-wave tubes","url":"/topics/S85137180","kind":"topic-directory","aeo_cohort":"topic-directory","catalogue_revision":"f050b5d4780b1289","numeric_address":"903046492145993216","address_version":"morton4x16-v1","coordinates":[0,20,19548,28672],"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}