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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 = '248') AND (category.subclass = '156') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '248'; Subclass is '156';

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T / S Patent Date Description Patentee Category Assigned To
 1948
U Specimen known 2,450,730 October 5, 1948 Post and Insulator for Electric Fences
Electric fence composed of a rod and adjustable insulator to hold the conductor		 HORD, Guy
 Electric Fence  

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