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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 = '16') AND (category.subclass = 'DIG30') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '16'; Subclass is 'DIG30';

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T / S Patent Date Description Patentee Category Assigned To
 1924
U 1,484,569 February 19, 1924 Ceramic Body
Method of making a suspension disk by inserting a fired porcelain part inside the bottom of an unfired disk, then firing the disk, which shrinks around the insert securing a cemented pin inside		 SCHEID, Johannes Friedrich
 Suspension H. Schomburg & Shone

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