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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 = '411') AND (category.subclass = '172') ORDER BY date ASC, patent, type

Total of 2 patents found where: Class is '411'; Subclass is '172';

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T / S Patent Date Description Patentee Category Assigned To
 1912
U 1,013,250 January 2, 1912 Insulator Pin
Pin for mine insulator comprised of split sheet metal		 WILSON, Walter J.
 Pin  
U 1,022,121 April 2, 1912 Insulator Pin
Pin, metal with barbs to hold it in hole in crossarm		 BOYLAND, Clarence Joseph
 Pin  

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