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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 = '29') AND (category.subclass = '825') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '29'; Subclass is '825';

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T / S Patent Date Description Patentee Category Assigned To
 1977
U 4,047,279 September 13, 1977 Upgrading Current Distribution Insulators
Miscellaneous insulator with male screw to receive existing insulator for upgrading		 PETTIT, Ernest E.
 Miscellaneous W. Leon Sell/Ernest E. Pettit/R. Don Sell

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