Knut Østby
Participating in three Summer Olympics , he won a silver medal in the K-2 10000 m event at London in 1948 and another in the K-2 1000 m event at the 1950 World Championships . 
<triplet> Summer Olympics <subj> 1948 <obj> has part <triplet> 1948 <subj> Summer Olympics <obj> instance of <subj> 1948 <obj> point in time <triplet> 1950 World Championships <subj> 1950 <obj> point in time