Even today if you don't have private healthcare you wouldn't be entitled to certain procedures.
Look how much open heart surgery costs
today , you really think this was available to black people 20 yrs after the end of slavery
Like I said, these inventors were funded by white capitalists, to further the capitalist agenda.
On the grand scale of things, the fact a black man who was employed my a white man to create something. Whether it be a traffic light, internet, mop etc doesn't impact the advancement of black people.
Now when you talk about an inventor like the Prophet Marcus Garvey, who invented the first and biggest black owned and self financed company in the history of the world. Then imma hear you out, coz that definitely impacted the advancement of black people