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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 = '138') AND (category.subclass = '173') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '138'; Subclass is '173';

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T / S Patent Date Description Patentee Category Assigned To
 1875
U 159,007 January 19, 1875 Improvement in Lightning Rods
Lightning rod made of sheet metal formed with spiral-fluted sides with edges locking together and crimping the edges of the star wings to on each end of two sections to secure them together		 WILMOT, Samuel R.
 Lightning Rod  

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