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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 = '222.52') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '248'; Subclass is '222.52';

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T / S Patent Date Description Patentee Category Assigned To
 1931
U 1,829,926 November 3, 1931 Insulator Pin
Steel pin with saddle that fits over a curved-top crossarm		 HAWLEY, Kent A.
 Pin Locke Insulator Corp.

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