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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 = '257') AND (category.subclass = 'E23.099') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '257'; Subclass is 'E23.099';

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T / S Patent Date Description Patentee Category Assigned To
 1920
U 1,335,801 April 6, 1920 Insulator
Electrose strain (Brown p. 69)		 STEINBERGER, Louis
 Electrose  

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