CPV code 45520000 designates Hire of earthmoving equipment with operator in the Common Procurement Vocabulary (CPV 2008), the EU classification used to describe the subject of public contracts.
45520000 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 45500000 (Hire of construction and civil engineering machinery and equipment with operator).