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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 = '218') AND (category.subclass = '91') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '218'; Subclass is '91';

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T / S Patent Date Description Patentee Category Assigned To
 1931
U 1,819,302 August 18, 1931 Oil and Air Break Pothead Disconnect
Pothead disconnect		 RAH, Joseph
 Insulator G. & W. Electric Specialty Co.

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