Unusual Porcelain Coffee Filter

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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