The history of mammography begins with the discovery of X-rays in 1895. But it took a very long time for breast imaging to advance, in part because it wasn't prioritized.
Research:

Behind the Scenes Minis: Piece of Work
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E. Virgil Neal: Hypnotist, Fraudster, Tycoon, Part 2
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E. Virgil Neal: Hypnotist, Fraudster, Tycoon - Part 1
35:28