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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 = '208') AND (category.subclass = '21') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '208'; Subclass is '21';

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T / S Patent Date Description Patentee Category Assigned To
 1889
U 415,864 November 26, 1889 Composition for Overhead Insulators
Composition insulator from ""Gilsonite""		 GILSON, Samuel H.
 Composition  

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