|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 = '451') AND (category.subclass = '239') ORDER BY date ASC, patent, type|
Total of 1 patents found where: Class is '451'; Subclass is '239';
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|T / S||Patent||Date||Description||Patentee||Category||Assigned To|
|U||1,186,203||June 6, 1916||Apparatus for Use in Manufacturing Articles of Ceramic Material
Method of manufacturing spark plugs
|JEFFERY, Joseph A.
JEFFERY, Benjamin A.
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