List of the CPV codes beginning with 51 : 2nd level
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| CPV CODE | DESCRIPTION |
| 51000000-9 | Installation services (except software). |
| 51100000-3 | Installation services of electrical and mechanical equipment. |
| 51110000-6 | Installation services of electrical equipment. |
| 51111000-3 | Installation services of electric motors, generators and transformers. |
| 51111100-4 | Installation services of electric motors. |
| 51111200-5 | Installation services of generators. |
| 51111300-6 | Installation services of transformers. |
| 51112000-0 | Installation services of electricity distribution and control equipment. |
| 51112100-1 | Installation services of electricity distribution equipment. |
| 51112200-2 | Installation services of electricity control equipment. |
| 51120000-9 | Installation services of mechanical equipment. |
| 51121000-6 | Installation services of fitness equipment. |
| 51122000-3 | Installation services of flagpoles. |
| 51130000-2 | Installation services of steam generators, turbines, compressors and burners. |
| 51131000-9 | Installation services of steam generators. |
| 51133000-3 | Installation services of turbines. |
| 51133100-4 | Installation services of gas turbines. |
| 51134000-0 | Installation services of compressors. |
| 51135000-7 | Installation services of furnaces. |
| 51135100-8 | Installation services of burners. |
| 51135110-1 | Installation services of waste incinerators. |
| 51140000-5 | Installation services of engines. |
| 51141000-2 | Installation services of petrol engines. |
| 51142000-9 | Installation services of diesel engines. |
| 51143000-6 | Installation services of railway engines. |
| 51144000-3 | Installation services of vehicle engines. |
| 51145000-0 | Installation services of marine engines. |
| 51146000-7 | Installation services of aircraft engines. |
| 51200000-4 | Installation services of equipment for measuring, checking, testing and navigating. |
| 51210000-7 | Installation services of measuring equipment. |
| 51211000-4 | Installation services of time-measuring equipment. |
| 51212000-1 | Installation services of time register equipment. |
| 51213000-8 | Installation services of time recorder equipment. |
| 51214000-5 | Installation services of parking meter equipment. |
| 51215000-2 | Installation services of meteorological equipment. |
| 51216000-9 | Installation services of geological equipment. |
| 51220000-0 | Installation services of checking equipment. |
| 51221000-7 | Installation services of automatic airport check-in devices. |
| 51230000-3 | Installation services of testing equipment. |
| 51240000-6 | Installation services of navigating equipment. |
| 51300000-5 | Installation services of communications equipment. |
| 51310000-8 | Installation services of radio, television, sound and video equipment. |
| 51311000-5 | Installation services of radio equipment. |
| 51312000-2 | Installation services of television equipment. |
| 51313000-9 | Installation services of sound equipment. |
| 51314000-6 | Installation services of video equipment. |
| 51320000-1 | Installation services of radio and television transmitters. |
| 51321000-8 | Installation services of radio transmitters. |
| 51322000-5 | Installation services of television transmitters. |
| 51330000-4 | Installation services of radiotelephony apparatus. |
| 51340000-7 | Installation services of line telephony equipment. |
| 51350000-0 | Installation services of line telegraphy equipment. |
| 51400000-6 | Installation services of medical and surgical equipment. |
| 51410000-9 | Installation services of medical equipment. |
| 51411000-6 | Installation services of imaging equipment. |
| 51412000-3 | Installation services of dental and subspecialty equipment. |
| 51413000-0 | Installation services of radiotherapy equipment. |
| 51414000-7 | Installation services of mechanotherapy equipment. |
| 51415000-4 | Installation services of electrotherapyequipment. |
| 51416000-1 | Installation services of physical therapy equipment. |
| 51420000-2 | Installation services of surgical equipment. |
| 51430000-5 | Installation services of laboratory equipment. |
| 51500000-7 | Installation services of machinery and equipment. |
| 51510000-0 | Installation services of general-purpose machinery and equipment. |
| 51511000-7 | Installation services of lifting and handling equipment, except lifts and escalators. |
| 51511100-8 | Installation services of lifting equipment. |
| 51511110-1 | Installation services of cranes. |
| 51511200-9 | Installation services of handling equipment. |
| 51511300-0 | Installation services of suspended access equipment. |
| 51511400-1 | Installation services of special conveying systems. |
| 51514000-8 | Installation services of miscellaneous general-purpose machinery. |
| 51514100-9 | Installation services of liquid filtering or purifying machinery and apparatus. |
| 51514110-2 | Installation services of machinery and apparatus for filtering or purifying water. |
| 51520000-3 | Installation services of agricultural and forestry machinery. |
| 51521000-0 | Installation services of agricultural machinery. |
| 51522000-7 | Installation services of forestry machinery. |
| 51530000-6 | Installation services of machine tools. |
| 51540000-9 | Installation services of special-purpose machinery and equipment. |
| 51541000-6 | Installation services of mining, quarrying, construction and metallurgy machinery. |
| 51541100-7 | Installation services of mining machinery. |
| 51541200-8 | Installation services of quarrying machinery. |
| 51541300-9 | Installation services of construction machinery. |
| 51541400-0 | Installation services of metallurgy machinery. |
| 51542000-3 | Installation services of food-, beverage- and tobacco-processing machinery. |
| 51542100-4 | Installation services of food-processing machinery. |
| 51542200-5 | Installation services of beverage-processing machinery. |
| 51542300-6 | Installation services of tobacco-processing machinery. |
| 51543000-0 | Installation services of textile-, clothing- and leather-production machinery. |
| 51543100-1 | Installation services of textile-production machinery. |
| 51543200-2 | Installation services of clothing-production machinery. |
| 51543300-3 | Installation services of leather-production machinery. |
| 51543400-4 | Installation services of laundry washing, dry-cleaning and drying machines. |
| 51544000-7 | Installation services of paper- and paperboard-production machinery. |
| 51544100-8 | Installation services of paper-production machinery. |
| 51544200-9 | Installation services of paperboard-production machinery. |
| 51545000-4 | Installation services of street mailboxes. |
| 51550000-2 | Installation services of weapon systems. |
| 51600000-8 | Installation services of computers and office equipment. |
| 51610000-1 | Installation services of computers and information-processing equipment. |
| 51611000-8 | Installation services of computers. |
| 51611100-9 | Hardware installation services. |
| 51611110-2 | Installation services of airport real-time departures and arrival display screens or boards. |
| 51611120-5 | Installation services of railway real-time departures and arrival display screens or boards. |
| 51612000-5 | Installation services of information-processing equipment. |
| 51620000-4 | Installation services of office equipment. |
| 51700000-9 | Installation services of fire protection equipment. |
| 51800000-0 | Installation services of metal containers. |
| 51810000-3 | Installation services of tanks. |
| 51820000-6 | Installation services of reservoirs. |
| 51900000-1 | Installation services of guidance and control systems. |