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Klaas Jan Bosma
| Last name | Bosma |
| First name | Klaas Jan |
| Gender | Male |
| Birthdate | 06.1973 |
| Country | NED |
| 500m | 40,96 (Heerenveen, 03.11.1991) |
| 1.000m | 1.24,61 (Heerenveen, 14.03.1991) |
| 1.500m | 2.12,08 (Heerenveen, 23.12.1991) |
| 3.000m | 4.59,75 (Heerenveen, 05.01.1992) |
| 5.000m | 9.04,78 (Heerenveen, 09.12.1990) |
| Sprint | 83,265 |
| Small Combo | 189,422 |
| Mini Combo | 177,249 |
| Tiny Combo | 127,291 |
| Latest update in | 1992 |
NED