Don't know about the other guys, but kind of knew about Bobby Morrow. He won 3 golds in the '56 Olympics. He ended up running 47.7 and maybe 20.5. My sister's high school had a guy run 46.5 (back in 60s) and another dude ran 1:48XX. They held the national prep records for like the 4 x 400 and sprint medley. The 1:48 guy had the state record for like 40 years.
Don't know about the other guys, but kind of knew about Bobby Morrow. He won 3 golds in the '56 Olympics. He ended up running 47.7 and maybe 20.5. My sister's high school had a guy run 46.5 (back in 60s) and another dude ran 1:48XX. They held the national prep records for like the 4 x 400 and sprint medley. The 1:48 guy had the state record for like 40 years.