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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 = '307') AND (category.subclass = '148') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '307'; Subclass is '148';

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T / S Patent Date Description Patentee Category Assigned To
 1893
U 506,002 October 3, 1893 Insulating Support for Metallic Circuits
Oil cup insulator to support short crossarm for two insulators		 COUSENS, Alfred C.
 Oil Charles Stone

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