Around 1938, Jones designed a portable air-cooling unit for trucks carrying perishable food,
and received a patent for it on July 12, 1940.
Numero sold his movie sound equipment business to RCA and formed a new company in partnership with Jones, the U.S. Thermo Control Company (later the Thermo King Corporation) which became a $3 million business by 1949.
Portable cooling units designed by Jones were especially important during World War II, preserving blood, medicine, and food for use at army hospitals and on open battlefields.
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