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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 = '522') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '411'; Subclass is '522';

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T / S Patent Date Description Patentee Category Assigned To
 1877
U 186,503 January 23, 1877 Improvement in Lightning Rod Connector Clips
Coupling or connector clip composed of flat metal bent around the adjoining rod with external threads formed on the end so the rod can be screwed onto the clip		 SHOOK, Albert
 Lightning Rod Coupling  

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