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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 = '257') AND (category.subclass = 'E29.114') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '257'; Subclass is 'E29.114';

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T / S Patent Date Description Patentee Category Assigned To
 1894
U 515,779 March 6, 1894 Strain Insulator
Strain type		 LUSCOMB, Henry H.
 Strain The Johns Pratt Co.

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