{"id":"S85099759","label":"Percussion drilling","description":"","source_url":"https://id.loc.gov/authorities/subjects/sh85099759","normalized_label":"percussion drilling","broader":["http://id.loc.gov/authorities/subjects/sh85015851"],"aliases":["Air percussion drilling","Drilling, Percussive","Percussive drilling"],"source_identifier":"http://id.loc.gov/authorities/subjects/sh85099759","provider":"lcsh","revision":"bb9ab14c911bc132","taxonomy_revision":"f050b5d4780b1289","title":"Percussion drilling","url":"/topics/S85099759","kind":"topic-directory","aeo_cohort":"topic-directory","catalogue_revision":"f050b5d4780b1289","numeric_address":"9550103187042992708","address_version":"morton4x16-v1","coordinates":[0,20,18963,48128],"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}