Answer the following question: What type of details about walter lehmann -lrb- gymnast -rrb- can be gathered from the following bio? Bio: walter lehmann -lrb- born january 13 , 1919 -rrb- is a swiss gymnast , world champion and olympic medalist . he competed at the 1948 summer olympics in london where he received silver medals in '' individual allround '' , '' horizontal bar '' and '' team combined exercises '' . he became world champion in '' individual all round '' in 1950 .
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