which silver medalist of the athletics at the 1928 summer olympics – men's marathon was also the flagbearer of the chile at the 1924 summer olympics
SELECT DISTINCT var_uri where brack_open dbr_Athletics_at_the_1928_Summer_Olympics_–_Men's_marathon dbo_silverMedalist var_uri sep_dot dbr_Chile_at_the_1924_Summer_Olympics dbp_flagbearer var_uri brack_close