|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 = '403') AND (category.subclass = '275') ORDER BY date ASC, patent, type|
Total of 2 patents found where: Class is '403'; Subclass is '275';
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|T / S||Patent||Date||Description||Patentee||Category||Assigned To|
|U||196,235||October 16, 1877||Improvement in Lightning Rods
Lightning rod made with a spirally fluted tubular core with one or more smaller tubular wires wrapped around in the fluted depressions with coupling having a male thread on each end to screw into end of rod which has female threads
|KNAPP, George S.
|U||940,742||November 23, 1909||Water Retaining and Conveying Attachment for Cable Lightning Rods
Method of retaining water in the ground to aid in conducting the current to ground
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