{"id":"S85085499","label":"Mine communication systems","description":"","source_url":"https://id.loc.gov/authorities/subjects/sh85085499","normalized_label":"mine communication systems","broader":["http://id.loc.gov/authorities/subjects/sh85122402","http://id.loc.gov/authorities/subjects/sh85133301"],"aliases":["Mine signaling systems","Telecommunication in mining"],"source_identifier":"http://id.loc.gov/authorities/subjects/sh85085499","provider":"lcsh","revision":"6f3a4b93d75ef76f","taxonomy_revision":"f050b5d4780b1289","title":"Mine communication systems","url":"/topics/S85085499","kind":"topic-directory","aeo_cohort":"topic-directory","catalogue_revision":"f050b5d4780b1289","numeric_address":"10124311881838888448","address_version":"morton4x16-v1","coordinates":[0,20,18740,60416],"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}