This mysterious little contraption is not an electric insulator, nor the world’s heaviest baby rattle, but a ceramic coffee filter. Ceramic coffee filters were used as part of the vacuum brewing method originally invented in France in the early 1700’s. As the popularity of coffee grew, the process of filtering the coffee grounds also grew. The vacuum brewing process made a come-back in America in the early nineteenth century which is when our piece was patented. In 1945, Kent Productions Company, patented their version of the vacuum brewing machine along with a ceramic filter.
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