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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 = '439') AND (category.subclass = '809') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '439'; Subclass is '809';

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T / S Patent Date Description Patentee Category Assigned To
 1912
U Specimen known 1,014,934 January 16, 1912 Insulator Knob
Knob		 BAKER, George
 Knob  

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