|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 = '219') AND (category.subclass = '388') ORDER BY date ASC, patent, type|
Total of 1 patents found where: Class is '219'; Subclass is '388';
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|T / S||Patent||Date||Description||Patentee||Category||Assigned To|
|U||1,451,815||April 17, 1923||Rapid Decorating Firing Furnace or Kiln
Kiln for firing porcelain spark plug insulators
|DAVENPORT, Ransom W.
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