| Games |
Sport (Discipline) / Event |
NOC / Team |
Phase |
Unit |
Role |
As |
|
|
1948 Summer Olympics
|
Water Polo (Aquatics) |
 NED |
|
|
|
Henk de Kok |
|
|
Water Polo, Men
(Olympic)
|
|
Match #2 |
Hungary — France |
Referee |
|
|
|
Water Polo, Men
(Olympic)
|
|
Match #2 |
France — Spain |
Goal Judge |
|
|
|
Water Polo, Men
(Olympic)
|
|
Match #2 |
Argentina — Egypt |
Goal Judge |
|
|
|
Water Polo, Men
(Olympic)
|
|
Match #1 |
United States — Uruguay |
Goal Judge |
|
|
|
Water Polo, Men
(Olympic)
|
|
Match #1 |
Sweden — Switzerland |
Goal Judge |
|
|
|
Water Polo, Men
(Olympic)
|
|
Match #2 |
Yugoslavia — Australia |
Referee |
|
|
|
1964 Summer Olympics
|
Water Polo (Aquatics) |
NED |
|
|
|
Henk de Kok |
|
|
Water Polo, Men
(Olympic)
|
|
Match #1 |
Hungary — Italy |
Goal Judge |
|
|
|
Water Polo, Men
(Olympic)
|
|
Match #3 |
Italy — Unified Team of Germany |
Referee |
|
|
|
Water Polo, Men
(Olympic)
|
|
Match #4 |
Romania — Soviet Union |
Goal Judge |
|
|
|
Water Polo, Men
(Olympic)
|
|
Match #3 |
Romania — Japan |
Referee |
|
|
|
Water Polo, Men
(Olympic)
|
|
Match #1 |
Soviet Union — Australia |
Goal Judge |
|
|