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Jan Posthuma
| Last name | Posthuma |
| First name | Jan |
| Gender | Male |
| Birthdate | 05.1955 |
| Country | NED |
| 500m | 41,90 (Deventer, 05.11.1978) |
| 1.000m | 1.27,6 (Deventer, 12.12.1978) |
| 1.500m | 2.10,0 (Deventer, 29.01.1978) |
| 3.000m | 4.40,6 (Deventer, 31.01.1978) |
| 5.000m | 8.04,1 (Deventer, 29.01.1978) |
| 10.000m | 16.55,6 (Deventer, 30.01.1979) |
| Big Combo | 184,423 |
| Sprint | 85,700 |
| Small Combo | 180,409 |
| Mini Combo | 175,799 |
| Tiny Combo | 129,033 |
| Latest update in | 1979 |
NED