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Marnix Koolhaas
| Last name | Koolhaas |
| First name | Marnix |
| Gender | Male |
| Birthdate | 01.1960 |
| Country |  NED |
| 500m | 48,20 (Davos, 05.01.1979) |
| 1.000m | 1.48,0 (Davos, 03.01.1979) |
| 1.500m | 2.51,9 (Haarlem, 16.02.1979) |
| 3.000m | 6.06,6 (Haarlem, 02.02.1979) |
| 5.000m | 13.30,5 (El Calafate, 02.07.2005) |
| 10.000m | 30.44,4 (Ushuaia V, 29.06.2008) |
| Big Combo | 278.77 |
| Sprint | 102.200 |
| Small Combo | 247.65 |
| Mini Combo | 220.6 |
| Tiny Combo | 159.5 |
| Latest update in | 2008 |