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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 = 'DIG.3') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '256'; Subclass is 'DIG.3';

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T / S Patent Date Description Patentee Category Assigned To
 1889
U 401,095 April 9, 1889 Lightning Conductor for Wire Fences
Lightning rod connecting all strands of barbed wire fencing to ground to prevent lightning killing cattle which are standing near the fence		 WOOD, Fremont E.
 Lightning Rod Fence  

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