|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 = '72') AND (category.subclass = '256') ORDER BY type ASC, date, patent|
Total of 1 patents found where: Class is '72'; Subclass is '256';
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|T / S||Patent||Date||Description||Patentee||Category||Assigned To|
|U||941,032||November 23, 1909||Process of Manufacturing Insulators
Press to mold and produce composition strain insulator
||Press||The Macallen Co.|
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