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Black and white dagram of the Thermo King Model A included in Frederick M. Jones’ 1939 patent application to the U.S. Patent and Trademark Office.

Thermo King Model A

Diagram of the Thermo King Model A included in Frederick M. Jones’ 1939 patent application to the U.S. Patent and Trademark Office.

Thermo King Model C

Front component of a Thermo King Model C. Image is from the Frederick M. Jones papers, Minnesota Historical Society, St. Paul.

Thermo King unit

Thermo King unit, c.1960. Image is from the Frederick M. Jones Papers, Minnesota Historical Society, St. Paul.

Black and white photograph of Frederick McKinley Jones standing next to a truck outfitted with a mobile refrigeration unit, c.1950.

Frederick McKinley Jones

Frederick McKinley Jones standing next to a truck outfitted with a mobile refrigeration unit, c.1950.

Thermo King Model C

In 1939, Frederick McKinley Jones patented the world’s first successful refrigerated transportation system. At the time, he was working for the Minneapolis-based company U.S. Thermo Control. Two years later, he released an improved version, the Model C, which revolutionized the agriculture and military industries.

MN90: Honeywell's Hot Little Thermostat

The Honeywell round thermostat design is one of the most user-friendly and underappreciated appliance designs of all time. MN90 Producer Andi McDaniel explains what has made the “T86 Round” so popular and so enduring.

MN90: Honeywell's Hot Little Thermostat

The Honeywell round thermostat design is one of the most user-friendly and underappreciated appliance designs of all time. MN90 Producer Andi McDaniel explains what has made the “T86 Round” so popular and so enduring.

Black and white image of Honeywell Round thermostat.

Honeywell Round thermostat

The Honeywell Round, 2007. Photograph by Wikimedia Commons user Flickr user midnightcomm.

Color image of Honeywell Chronotherm counter sign.

Honeywell Chronotherm counter sign

Metal stand-up counter sign advertising the Minneapolis-Honeywell Regulator Company's Chronotherm Automatic Thermostat. Created by Donaldson Art Sign between 1930 and 1945.

Black and white photograph of Honeywell Round thermostats ready for final checkout and packaging at a factory in Golden Valley, c.1955.

Honeywell Round thermostats ready for final checkout and packaging

Honeywell Round thermostats ready for final checkout and packaging at a factory in Golden Valley, c.1955.

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