|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 = '264') AND (category.subclass = '319') ORDER BY specimen ASC, date, patent, type|
Total of 2 patents found where: Class is '264'; Subclass is '319';
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|T / S||Patent||Date||Description||Patentee||Category||Assigned To|
|U||2,068,941||January 26, 1937||Process and Apparatus for Manufacturing Insulators
Plunger to first form the pinhole in a porcelain insulator by first plunging a pinhole without threads then form the threads
|BOVARD, Floyd G.
||Press||The Ohio Brass Co.|
|U||1,407,550||February 21, 1922||Method and Machine for Forming Impressions in Plastic Articles
Threading porcelain by gyrating the thread mandrel (""wobbler"" method)
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