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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 = '104') AND (category.subclass = '7.1') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '104'; Subclass is '7.1';

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T / S Patent Date Description Patentee Category Assigned To
U 796,501 August 8, 1905 Conductor Rail Holder for Electric Railways
Third rail insulator and metal clips and rail holder
Third Rail  

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