EntityQ13745309· pop 5· linked from 10 articlesKoos KöhlerSign in to saveDutch water polo playerConnectionsAmsterdamEntitywater poloEntity1928 Summer OlympicsEntitySlotenEntitySjaak KöhlerEntityCategories1905 births1965 deaths20th-century Dutch sportsmenDutch male water polo playersOlympic water polo players for the NetherlandsWater polo players at the 1928 Summer OlympicsWater polo players from Amsterdam