| 86429 | Objects, metal, manufacturing of, by pressure | |
| 86429 | Objects, metal, manufacturing of, by sintering | |
| 86429 | Objects, metal, manufacturing of, from metal powders | |
| 85340 | Objects, sterilizing of | |
| 93122 | Obstetrical consultation services | |
| 93110 | Obstetrical services delivered under the direction of medical doctors | |
| 91133 | Occupation certificates, building, issuing of | |
| 93191 | Occupational therapy services | |
| 72222 | Office buildings and associated land, sales of, on a fee or contract basis | |
| 85330 | Office buildings, general cleaning of | |
| 54122 | Office buildings, general construction of | |
| 85330 | Office buildings, general maintenance of | |
| 72122 | Office buildings, own-account sales of | |
| 72112 | Office buildings, rental or leasing of | |
| 73123 | Office equipment (excl. computers), rental or leasing of, without operator | |
| 62383 | Office equipment, mail order retail trade services of | |
| 62183 | Office equipment, non-specialized store retail trade services of | |
| 62483 | Office equipment, other non-store retail trade services of | |
| 62583 | Office equipment, retail trade services of, on a fee or contract basis | |
| 61283 | Office equipment, wholesale trade services of on a fee or contract basis | |
| 61183 | Office equipment, wholesale trade services of, except on a fee or contract basis | |
| 62383 | Office furniture, mail order retail trade services of | |
| 62183 | Office furniture, non-specialized store retail trade services of | |
| 62483 | Office furniture, other non-store retail trade services of | |
| 73123 | Office furniture, rental or leasing of | |
| 62583 | Office furniture, retail trade services of, on a fee or contract basis | |
| 62283 | Office furniture, specialized store retail trade services of | |
| 61183 | Office furniture, wholesale trade services of, except on a fee or contract basis | |
| 61283 | Office furniture, wholesale trade services of, on a fee or contract basis | |
| 73123 | Office machinery (excl. computers), rental or leasing of, without operator | |
| 86540 | Office machinery, installation of | |
| 62383 | Office machinery, mail order retail trade services of | |
| 87120 | Office machinery, maintenance and repair of | |
| 62183 | Office machinery, non-specialized store retail trade services of | |
| 62483 | Office machinery, other non-store retail trade services of | |
| 62583 | Office machinery, retail trade services of, on a fee or contract basis | |
| 62283 | Office machinery, specialized store retail trade services of | |
| 61183 | Office machinery, wholesale trade services of, except on a fee or contract basis | |
| 61283 | Office machinery, wholesale trade services of, on a fee or contract basis | |
| 83115 | Office management, consulting services concerning | |