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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 = '24') AND (category.subclass = 'DIG8') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '24'; Subclass is 'DIG8';

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T / S Patent Date Description Patentee Category Assigned To
 1909
U 918,339 April 13, 1909 System for Insulation for High voltage Electric Conductors
Insulator multiples		 LOCKE, Fred M.
 Insulator  

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