Vintage Poloron Thermaster Portable Refrigerator Cooler Metal 1950s. In good vintage condition. Please, see the photos for more details. Vintage Poloron Thermaster Portable Refrigerator Cooler Metal 1950s In good vintage condition. Check out our entire store for more great products and deals! We do however make every possible attempt to accurately describe the inventory we sell and stand behind it. Since 2016, 8TEN Industries has been a leading asset recovery provider supporting national retailers, brands, and manufacturers. Our 60,000 square foot processing and distribution facility located in Cass City, Michigan has allowed us to become industry leader in turning difficult problems for manufacturers into great deals for our customers.