https://www.lexpera.com.tr/resmi-gazete/01-04-1988/19772 monthly 2026-10-09T14:54:39Z https://www.lexpera.com.tr/resmi-gazete/metin/yaylar-cekmeye-calisan-silindirik-helisel-yuvarlak-telden-soguk-sarilmis-ts-1442-standardinin 1988-04-01T00:00:00Z