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Jan Portema
| Last name | Portema |
| First name | Jan |
| Gender | Male |
| Birthdate | 08.1956 |
| Country | NED |
| 500m | 43,00 (Heerenveen, 03.11.1978) |
| 1.000m | 1.34,2 (Heerenveen, 28.10.1984) |
| 1.500m | 2.10,4 (Heerenveen, 05.03.1981) |
| 3.000m | 4.39,8 (Heerenveen, 20.02.1981) |
| 5.000m | 8.40,5 (Heerenveen, 24.02.1981) |
| Sprint | 90,100 |
| Small Combo | 185,149 |
| Mini Combo | 180,199 |
| Tiny Combo | 133,566 |
| Latest update in | 1985 |
NED