https://www.lexpera.com.tr/resmi-gazete/12-03-1990/20459 monthly 2026-07-22T06:30:33Z https://www.lexpera.com.tr/resmi-gazete/metin/olculer-ve-kalite-kontrol-genel-mudurlugu-mecburi-standard-90-17-18-sayili-teblig-20459-90-17-18 1990-03-12T00:00:00Z