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2. 73 Brands That Are Still Made Right Here in the USA - AOL

   www.aol.com/73-brands-still-made-usa-123000180.html

   Igloo Coolers. $25 from Igloo Shop Now Available on eBay. Many of the most-common cooler designs come from Igloo, and all the company's products come from a 1.4 million-square-foot facility near ...

3. Pulse tube refrigerator - Wikipedia

   en.wikipedia.org/wiki/Pulse_tube_refrigerator

   In most coolers gas is compressed and expanded periodically. Well-known coolers such as the Stirling engine coolers and the popular Gifford-McMahon coolers have a displacer that ensures that the cooling (due to expansion) takes place in a different region of the machine than the heating (due to compression). Due to its clever design, the PTR ...

4. Refrigerator - Wikipedia

   en.wikipedia.org/wiki/Refrigerator

   Food in a refrigerator with its door open. A refrigerator, commonly shortened to fridge, is a commercial and home appliance consisting of a thermally insulated compartment and a heat pump (mechanical, electronic or chemical) that transfers heat from its inside to its external environment so that its inside is cooled to a temperature below the room temperature. [1]

5. Dilution refrigerator - Wikipedia

   en.wikipedia.org/wiki/Dilution_refrigerator

   Pulse tube coolers are commonly used cryocoolers in dry dilution refrigerators. Dry dilution refrigerators generally follow one of two designs. One design incorporates an inner vacuum can, which is used to initially precool the machine from room temperature down to the base temperature of the pulse tube cooler (using heat-exchange gas).

6. 5 Items From the 1970s That Are Worth a Lot of Money - AOL

   www.aol.com/finance/5-items-1970s-worth-lot...

   Here are some examples of what just basic vintage games could make you if you sell them. Space Invaders (Atari 2600, 1978): $75 to $1,450 Pong (original Atari Pong C-100, 1972): $100 to $150

7. Smart refrigerator - Wikipedia

   en.wikipedia.org/wiki/Smart_refrigerator

   A smart refrigerator, also known as internet refrigerator, is a refrigerator which is able to communicate with the internet. [1] This kind of refrigerator is often equipped to determine itself whenever a food item needs to be replenished. [ 2 ]