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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 = '72') AND (category.subclass = '401') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '72'; Subclass is '401';

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T / S Patent Date Description Patentee Category Assigned To
 1871
U 116,453 June 27, 1871 Improvement in Machines for Joining Tubular Lightning Rods
Machine or dies for opening one end of a tubular lightning rod and compressing the end of another rod section so the two ends fit together and secured by soldering		 KNAPP, George S.
 Lightning Rod Coupling  

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