CPV code 50334300 designates Repair and maintenance services of line telex equipment in the Common Procurement Vocabulary (CPV 2008), the EU classification used to describe the subject of public contracts.
50334300 is a leaf code — the most specific level of its branch — so it can be used directly as the main CPV code of a contract notice. If it does not quite fit, check the neighbouring codes under 50334000 (Repair and maintenance services of line telephony and line telegraphy equipment).