which silver medalist of the athletics at the 1948 summer olympics – men's 400 metres hurdles was also the flagbearer of the ceylon at the 1948 summer olympics
SELECT DISTINCT var_uri where brack_open dbr_Athletics_at_the_1948_Summer_Olympics_–_Men's_400_metres_hurdles dbo_silverMedalist var_uri sep_dot dbr_Ceylon_at_the_1948_Summer_Olympics dbp_flagbearer var_uri brack_close