{"id":"S85144977","label":"Walschaert valve gears","description":"","source_url":"https://id.loc.gov/authorities/subjects/sh85144977","normalized_label":"walschaert valve gears","broader":["http://id.loc.gov/authorities/subjects/sh85078025","http://id.loc.gov/authorities/subjects/sh85127682"],"aliases":["Valve gears, Walschaert","Walschaert valve-gear","Walschaerts valve gears"],"source_identifier":"http://id.loc.gov/authorities/subjects/sh85144977","provider":"lcsh","revision":"9f696dc694b1469e","taxonomy_revision":"f050b5d4780b1289","title":"Walschaert valve gears","url":"/topics/S85144977","kind":"topic-directory","aeo_cohort":"topic-directory","catalogue_revision":"f050b5d4780b1289","numeric_address":"864774692480091712","address_version":"morton4x16-v1","coordinates":[0,20,19670,17408],"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}