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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 = '411') AND (category.subclass = '439') ORDER BY date ASC, patent, type

Total of 2 patents found where: Class is '411'; Subclass is '439';

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T / S Patent Date Description Patentee Category Assigned To
 1887
U 360,354 March 29, 1887 Insulator
Acoustic insulator to reduce vibration of telephone wires in acoustic or mechanical telephones		 LOCKE, Willie F.
 Acoustic 1/2 to John E. Robertson
 1941
U 2,237,717 April 8, 1941 Insulator Structure
Wireholder with multiple grooves and lag screw		 STEWART, Lory B.
STEWART, Alvin J.
 Wireholder 1/3 to Karl Thielscher

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