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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 = '218') AND (category.subclass = '2') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '218'; Subclass is '2';

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T / S Patent Date Description Patentee Category Assigned To
 1929
U 1,717,210 June 11, 1929 High Voltage Circuit Interrupter
High voltage air break switch		 GODDARD, Walter T.
 Transmission General Electric Co.

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