{"id":"S85020572","label":"Case hardening","description":"","source_url":"https://id.loc.gov/authorities/subjects/sh85020572","normalized_label":"case hardening","broader":["http://id.loc.gov/authorities/subjects/sh85021751","http://id.loc.gov/authorities/subjects/sh85084205","http://id.loc.gov/authorities/subjects/sh85127762","http://id.loc.gov/authorities/subjects/sh85130722"],"aliases":["Cyaniding"],"source_identifier":"http://id.loc.gov/authorities/subjects/sh85020572","provider":"lcsh","revision":"46347fc07bbf9b59","taxonomy_revision":"f050b5d4780b1289","title":"Case hardening","url":"/topics/S85020572","kind":"topic-directory","aeo_cohort":"topic-directory","catalogue_revision":"f050b5d4780b1289","numeric_address":"902976140518770240","address_version":"morton4x16-v1","coordinates":[0,20,17726,28672],"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}