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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 = '110R') ORDER BY specimen ASC, date, patent, type

Total of 3 patents found where: Class is '174'; Subclass is '110R';

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T / S Patent Date Description Patentee Category Assigned To
 1883
U 271,994 February 6, 1883 Electrical Insulator
Method of treating steatite to make artificial lava insulation
STEWARD, Demetrius M.
Lava  
 1868
U Specimen known 75,815 March 24, 1868 Improvement in Insulators for Telegraphs
Earthenware insulator, cemented galvanized pin coated with paraffin (Brown p. 57)
VARLEY, Cromwell F.
Earthenware  
 1962
U Specimen known 3,061,667 October 30, 1962 Telegraph Pole Line Insulator
Rubber pin type insulator (Brown p. 91)
MARKLEY, William F.
SLATER, James L.
Rubber Western Union Telegraph Co.

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