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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 = '73') AND (category.subclass = '439') ORDER BY description DESC, 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.
Manufacturing Locke Insulator Corp.

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