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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 = '523') AND (category.subclass = '207') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '523'; Subclass is '207';

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T / S Patent Date Description Patentee Category Assigned To
 1922
U 1,409,091 March 7, 1922 Cement
Cement composition		 GODDARD, Walter T.
 Cement Locke Insulator Corp.

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