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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 = '174') AND (category.subclass = '9R') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '174'; Subclass is '9R';

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T / S Patent Date Description Patentee Category Assigned To
 1898
U 615,896 December 13, 1898 Vacuum Insulator for Electric Conductors
Wall tube sealed in vacuum and protected from weather (see 608,906)		 POCHE, Joseph Arthur
 Wall Tube  

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