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The refrigerator replaced the icebox, which had been a common household appliance for almost a century and a half. The United States Food and Drug Administration recommends that the refrigerator be kept at or below 4 °C (40 °F) and that the freezer be regulated at −18 °C (0 °F). [5] The first cooling systems for food involved ice. [6]
This caused ice harvesting to become illegal in certain areas of the country. All of these scenarios increased the demands for modern refrigeration and manufactured ice. Ice producing machines like that of Carre's and Muhl's were looked to as means of producing ice to meet the needs of grocers, farmers, and food shippers. [26] [27]
The can opener consisting of the now familiar sharp rotating cutting wheel that runs round the can's rim to cut open the lid was invented in 1870, but was considered very difficult to operate for the ordinary consumer. A more successful design came out in 1925 when a second, serrated wheel was added to hold the cutting wheel on the rim of the can.
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