|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 = '174') AND (category.subclass = '21C') ORDER BY category ASC, date, patent, type|
Total of 1 patents found where: Class is '174'; Subclass is '21C';
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|T / S||Patent||Date||Description||Patentee||Category||Assigned To|
|U||30,560||November 6, 1860||Improvement in Lightning Rods
Lightning rod made up of continuous strips or tubes of metal
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