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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 = '181') AND (category.subclass = '138') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '181'; Subclass is '138';

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T / S Patent Date Description Patentee Category Assigned To
 1884
U 296,330 April 8, 1884 Insulator for Line Wires of Mechanical Telephones
Non-electrical (!!) insulator to suspend wires of mechanical telephones!!!		 GILLILAND, James F.
 Non-electrical John Bennet and August Meyer

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