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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 = '256') AND (category.subclass = 'DIG2') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '256'; Subclass is 'DIG2';

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T / S Patent Date Description Patentee Category Assigned To
 1875
U 163,807 May 25, 1875 Improvement in Lightning Rod Standards
Lightning rod stand with three legs		 REYBURN, William S.
MARTIN, Frederick J.
 Lightning Rod  

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