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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 = '557') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '439'; Subclass is '557';

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T / S Patent Date Description Patentee Category Assigned To
 1901
U 684,909 October 22, 1901 Insulating Bushing
Bushing		 COLE, John A.
 Bushing  

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