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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 = '174') AND (category.subclass = '81') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '174'; Subclass is '81';

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T / S Patent Date Description Patentee Category Assigned To
 1907
U 851,705 April 30, 1907 Insulator
Roof entry insulator		 STOTZ, Hugo
 Roof  

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