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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 = '191') AND (category.subclass = '27') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '191'; Subclass is '27';

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T / S Patent Date Description Patentee Category Assigned To
 1891
U 455,107 June 30, 1891 Insulator
Third rail insulator with cup to hold hygroscopic chemical and means to heat insulator to drive off moisture		 MUNSIE, James F.
 Third Rail  

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