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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 = '156') AND (category.subclass = '53') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '156'; Subclass is '53';

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T / S Patent Date Description Patentee Category Assigned To
 1878
U 199,506 January 22, 1878 Improvement in Insulating Underground Telegraph Wires
Underground cable insulated by wrapping with cotton, hemp, or jute and saturating it with paraffin and inserting the wires in heated metal pipes flushed with air to remove moisture.		 BROOKS, David
 Cable  

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