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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 = '229') AND (category.subclass = '87.13') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '229'; Subclass is '87.13';

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T / S Patent Date Description Patentee Category Assigned To
 1929
U 1,702,235 February 12, 1929 System of Line Insulation and Insulators Therefor
Odd Electrose insulator		 STEINBERGER, Louis
 Insulator  

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