↑ The sign associated with pottery churn from Beersheba, now displayed in the Israel Museum says: "The churn, used for making butter from milk, first appeared in the Chalcolithic Period [6,500–5,500 years ago] and became an important symbol of the time. To speed up the churning process, a rope was tied to the handles, and the churn was rocked back and forth." url: https://ferrelljenkins.blog/2013/05/23/churning-to-make-butter/
↑US723287A,Lawson, Roberta C.&Mclaren, Mary,"Tea-leaf holder",issued 1903-03-24
↑GB190612333A,Berry, Arthur Francis,"Improvements in or relating to Apparatus for the Electrical Production of Heat for Cooking and other purposes",issued 1907-05-25
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