|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 = '73') AND (category.subclass = '439') ORDER BY category ASC, date, patent, type|
Total of 1 patents found where: Class is '73'; Subclass is '439';
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|T / S||Patent||Date||Description||Patentee||Category||Assigned To|
|U||1,822,458||September 8, 1931||Measuring Apparatus
Device to measure the density of clay slip
|ROWLAND, Davidge H.
ROBERTSON, John C.
|Manufacturing||Locke Insulator Corp.|
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