https://www.lexpera.com.tr/resmi-gazete/09-07-1988/19867 monthly 2026-10-09T14:54:39Z https://www.lexpera.com.tr/resmi-gazete/metin/celik-boru-cift-katli-bakir-kaynakli-ts-5130-standardinin-uygulanmasina-dair-teblig-no-fks-88-79-79 1988-07-09T00:00:00Z