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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 = '15') AND (category.subclass = '22.1') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '15'; Subclass is '22.1';

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T / S Patent Date Description Patentee Category Assigned To
 1933
U 1,904,608 April 18, 1933 Insulator Finishing Brushing Machine
Machine to grind down interlinking passages in a semi-dry insulator body for metal fittings		 BETTINI, David
 Manufacturing Locke Insulator Corp.

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