{"id":"S2009008102","label":"Opposed piston engines","description":"","source_url":"https://id.loc.gov/authorities/subjects/sh2009008102","normalized_label":"opposed piston engines","broader":["http://id.loc.gov/authorities/subjects/sh85043258","http://id.loc.gov/authorities/subjects/sh85067314"],"aliases":[],"source_identifier":"http://id.loc.gov/authorities/subjects/sh2009008102","provider":"lcsh","revision":"ab8a562c5308c9cc","taxonomy_revision":"f050b5d4780b1289","title":"Opposed piston engines","url":"/topics/S2009008102","kind":"topic-directory","aeo_cohort":"topic-directory","catalogue_revision":"f050b5d4780b1289","numeric_address":"14144896043103708772","address_version":"morton4x16-v1","coordinates":[0,478,64543,38912],"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}