Mary Beatrice Davidson Kenner was an African-American inventor most noted for her improvement of the adjustable sanitary belt, although racial discrimination caused her patent for the sanitary belt to be prevented for two year (1954-1956) a falsified claim of her patent being denied for 30 years has been sited that would make her 14 years old during development which is untrue. It is well documented based of US patent applications.

https://en.wikipedia.org/wiki/Mary_Kenner

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