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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 = '144') AND (category.subclass = '250.1') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '144'; Subclass is '250.1';

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T / S Patent Date Description Patentee Category Assigned To
 1851
U Specimen known 8,438 October 14, 1851 Improvement in Insulators for Telegraphs
CD 1012 & CD 1014, slotted glass tube mounted in a wooden bracket		 YANDELL, John
 Insulator  

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