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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 = '29') AND (category.subclass = '520') ORDER BY date ASC, patent, type

Total of 3 patents found where: Class is '29'; Subclass is '520';

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T / S Patent Date Description Patentee Category Assigned To
 1909
U 941,032 November 23, 1909 Process of Manufacturing Insulators
Press to mold and produce composition strain insulator		 MCCARTHY, Louis
 Press The Macallen Co.
 1928
U 1,685,833 October 2, 1928 Process of Manufacturing Insulator Pins
Manufacturing method to make steel pins for wooden crossarms		 AUSTIN, Arthur O.
 Manufacturing The Ohio Brass Co.
U 1,685,834 October 2, 1928 Process of Manufacturing Insulator Pins
Manufacturing method to make steel pins for wooden crossarms		 AUSTIN, Arthur O.
 Manufacturing The Ohio Brass Co.

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