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Koos Groenewold
| Last name | Groenewold |
| First name | Koos |
| Gender | Male |
| Birthdate | 10.1948 |
| Country | NED |
| 500m | 43,10 (Heerenveen, 08.02.1971) |
| 1.000m | 1.33,0 (Deventer IJ, 26.01.1974) |
| 1.500m | 2.17,41 (Hoorn, 07.11.2009) |
| 3.000m | 4.49,06 (Amsterdam, 07.12.2004) |
| 5.000m | 8.27,3 (Heerenveen, 03.03.1970) |
| 10.000m | 19.48,1 (Deventer IJ, 02.02.1974) |
| Big Combo | 199,038 |
| Sprint | 89,600 |
| Small Combo | 187,809 |
| Mini Combo | 183,579 |
| Tiny Combo | 135,403 |
| Latest update in | 2010 |
NED