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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 = '220') AND (category.subclass = 'DIG1') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '220'; Subclass is 'DIG1';

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T / S Patent Date Description Patentee Category Assigned To
 1912
U 1,016,780 February 6, 1912 Insulator
Dry-spot, screw cap design		 RUTZKY, Paul
 Dry-spot  

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