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SELECT DISTINCT patent.*, YEAR(date) as year FROM patent LEFT JOIN category ON category.patent = patent.patent AND category.type = patent.type WHERE (category.class = '198') AND (category.subclass = '661') ORDER BY category ASC, date, patent, type

Total of 1 patents found where: Class is '198'; Subclass is '661';

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T / S Patent Date Description Patentee Category Assigned To
 Mixer
U 826,139 July 17, 1906 Device for Mixing Ingredients for Making Glass and for Feeding them to Furnaces
Mixer for mixing ingredients for glass insulators
BROOKFIELD, Henry M.
Mixer  

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