What did Frederick McKinley Jones invent that provided the foundation for the pharma cold chain?

Answer

The first practical, self-contained, automatic refrigeration unit for trucks and trailers

Frederick McKinley Jones is credited with developing and patenting the first practical, self-contained, automatic refrigeration unit designed for trucks and trailers during the 1940s. While his primary focus was not strictly pharmaceutical logistics technology at the time, this invention provided the essential foundational technology—reliable, mobile temperature control—that was later built upon to create the entire pharmaceutical cold chain infrastructure required for transporting temperature-sensitive medicines over long distances and varied climates.

What did Frederick McKinley Jones invent that provided the foundation for the pharma cold chain?
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