The real refrigerator was invented in the 1920s. 1920, Willis H. Carrier, an engineer in a flat-panel printing factory in Brooklyn, new york, designed a system to control temperature and humidity. The cellar owner and the manager of the milk company storing fur further improved the mechanical refrigerator technology as needed. During the First World War, some smaller household refrigerators appeared. This is a new invention, which is noisy and easy to leak. In fact, it just installed a motor and a rotating belt in the old "ice box" shell, which made it look like an experiment.
1923, when Quidel Danfray was a branch of general motors, it introduced a new mechanical refrigerator component and assembled it into a refrigerator. FreyGuide refrigerator is designed to put the "ice box" for storing perishable food and refrigeration machinery into a special cabinet. This device is quiet, convenient and compact. At this point, a new refrigerator style was born, and brand names were everywhere.
Since then, with the sharp increase in output, the price of refrigerators has plummeted. By 1944, about 85% of American families have mechanical refrigerators. "Ice box" has only been handed down as a word.