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Commercial fridge and freezer units, which go by many other names, were in use for almost 40 years prior to the common home models. They used toxic ammonia gas systems, making them unsafe for home use. Practical household refrigerators were introduced in 1915 and gained wider acceptance in the United States in the 1930s as prices fell and non-toxic, non-flammable synthetic refrigerants such as Freon or R-12 were introduced. It is notable that while 60% of households in the US owned a refrigerator by the 1930s, it was not until 40 years later, in the 1970s, that the refrigerator achieved a similar level of penetration appliances repair, sub zero refrigerator repair ,appliances subzero,appliance sub zero, appliance subzero, appliance refrigerator freezer, built in refridgerators,built in refrigerator freezer,built in refrigirators,built in freezer,built in freezers,built freezer in refrigerator,company freezer sub zero,co freezer sub zero,company information sub zero,compare sub zero refrigerator,discount sub zero appliances,discount subzero refrigerator,discount subzero appliances, freezer sub zerofreezer built in,freezers and wine storage,freezer company,freezer refrigerator sub zero, freezer refrigerator subzero,how to win a subzero refrigerator,old refrigerator storage wine,part refrigerator sub zero,price refrigerator sub wine zero,prices of subzero appliance,price on sub zero wine refrigerator,refrigerator built in,refrigerator freezer appliance,refrigerators of wine, refrigerators subzero,refrigerators sub zero,refrigerators wine storage, refrigerator storage wine,refrigerator sub wine zero,refrig sub zero,refrigerator subzero,refrigerator sub zero,refrigerators for wine, refrigerator for wine storage,refrigeration storage of wine, refrigeration
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