About Mary Kenner
Mary Beatrice Davidson Kenner was an African American inventor most noted for her development of the adjustable sanitary belt. Kenner received five patents, which includes a carrier attachment for invalid walker and bathroom tissue dispenser. Her father also patented a window washer for trains and invented a stretcher with wheels for ambulances. Her grandfather invented a light signal for trains, though this invention was stolen from him by a white man. Her sister, Mildred Davidson Austin Smith (1916–1993), invented, patented, and commercially sold board games.
Biography source: Wikipedia. The profile adds birthday-specific historical context from the Celebs Birthday Today editorial database.