These unusual white porcelain pieces are frequently mistaken for electrical insulators. The top ceramic bulb will unscrew allowing the four ceramic discs to be removed. This is actually a filter element from a coffee maker!
This piece is marked: KENT PRODUCTS CO. CHICAGO ILL. U.S. PAT 2,376,410
Above is an example of the Kent Product's coffee pot and below a copy of the referenced patent:
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Last updated September 5, 1999