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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 = '230.4') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '248'; Subclass is '230.4';

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T / S Patent Date Description Patentee Category Assigned To
 1925
U 1,564,918 December 8, 1925 Insulator Clamp
Clamp fitting in tie-wire groove to hold conductor		 WILLIAMS, Joseph Thomas
 Clamp  

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