CPV code 73400000 designates Research and Development services on security and defence materials in the Common Procurement Vocabulary (CPV 2008), the EU classification used to describe the subject of public contracts.
73400000 sits under 73000000 (Research and development services and related consultancy services) and groups 3 more specific sub-codes. When classifying a tender, choose the narrowest code that still covers the full subject of the contract.