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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 = '313') AND (category.subclass = '306') ORDER BY assigned_to DESC, date, patent, type

Total of 3 patents found where: Class is '313'; Subclass is '306';

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T / S Patent Date Description Patentee Category Assigned To
 Westinghouse Electric & Mfg. Co.
U 1,198,137 September 12, 1916 Insulator
Suspension insulator with an outer covering of spun steel or iron.		 LINCOLN, Paul M.
 Suspension Westinghouse Electric & Mfg. Co.
 Ste. Helita
U 2,644,026 June 30, 1953 Radioactive Lightning Protector with Accelerating Elements
Lightning rod with porcelain disk coated with radioactive material		 GRENIER, Joseph Pierre
LESCIEUX, Pierre Edouard Eugene
 Lightning Rod Ste. Helita
 
U 1,166,393 December 28, 1915 Insulator
Electrose high tension pintype insulator		 STEINBERGER, Louis
 Electrose  

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