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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 = '470') AND (category.subclass = '181') ORDER BY date ASC, patent, type

Total of 2 patents found where: Class is '470'; Subclass is '181';

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T / S Patent Date Description Patentee Category Assigned To
U 954,490 April 12, 1910 Machine for Threading Porcelain Insulators
Machine to form threads in wet process porcelain
YOUNG, George F.
Thread Pittsburg High Voltage Insulator Co.
U 1,567,027 December 29, 1925 Insulator Threading Machine
Machine to form threads in plastic clay
BENNETT, Cornelius Van Dyke
Press The Porcelain Insulator Corp.

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