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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 = '174') AND (category.subclass = '121R') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '174'; Subclass is '121R';

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T / S Patent Date Description Patentee Category Assigned To
U 51,935 January 9, 1866 Improvement in Insulating Telegraph Wires
Paraffin and rubber insulated wire
ELY, Alfred B.

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