africa was legitimately first in hand axes, and they did independently invent iron smelting. even though the hittites invented iron smelting 500 years before.
its possible they were the first to come up with boats. the pesse canoe from the netherlands is cited as the earliest physical boat remains, but that doesn't mean first actual boat. but far before that we know boats had to be used in some form or another because humans reached wallacia.
the CAT scan was invented by godfrey hounsfield who was british. it was also invented independently by allan cormack, who was born in south africa but he was white.
gas masks were developed in world war 1 by several german and british engineers.
the first electric traffic light was invented by J. P. Knight, a british railway engineer. elisha otis, a white american, invented the elevator.
christiaan barnard was born in south africa but wasn't black. he did the first heart transplant