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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 = 'E04') AND (category.subclass = '30') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is 'E04'; Subclass is '30';

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T / S Patent Date Description Patentee Category Assigned To
 1891
U Specimen known 464,036 December 1, 1891 Roof Cresting
Ornamental glass coping or cresting for roofs		 NELSON, Clark B.
 Roof Crest  

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