Mary Beatrice Davidson Kenner invented and patented an adjustable sanitary belt with an in-built, moisture-proof napkin pocket in 1956, even though she never profited from it. She also earned four more patents for other life-enhancing creations.

Sources to learn more about Kenner:

• https://youtu.be/But6oIYOETE

• https://lemelson.mit.edu/resources/mary-beatrice-davidson-kenner

• https://www.sciencemuseumgroup.org.uk/blog/happy-birthday-mary-kenner/

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