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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 = '106') AND (category.subclass = '817') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '106'; Subclass is '817';

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T / S Patent Date Description Patentee Category Assigned To
 1883
U 271,994 February 6, 1883 Electrical Insulator
Method of treating steatite to make artificial lava insulation		 STEWARD, Demetrius M.
 Lava  

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