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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 = '501') AND (category.subclass = '25') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '501'; Subclass is '25';

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T / S Patent Date Description Patentee Category Assigned To
 1940
U Specimen known 2,194,189 March 19, 1940 Pole Line Insulator
CD 142, CD 142.4 - tin & iron for iridized coating to reduce water adherence		 WHEELER, Herbert H.
MCGINNIS, Orris
THORDARSON, William
 Insulator Western Union Telegraph Co.

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