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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 = '106') AND (category.subclass = '230') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '106'; Subclass is '230';

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T / S Patent Date Description Patentee Category Assigned To
 1875
U Specimen known 158,868 January 19, 1875 Improvement in Insulating Compounds
Hook with composition compound of shellac, asbestos, coal tar & oak black		 SMITH, Isaac
 Hook 1/2 to George A. Chapman

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