|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 = '29') AND (category.subclass = '33D') ORDER BY date ASC, patent, type|
Total of 1 patents found where: Class is '29'; Subclass is '33D';
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|T / S||Patent||Date||Description||Patentee||Category||Assigned To|
|U||156,713||November 10, 1874||Improvement in Machines for Making Tubular Lightning Rods
Machine for making lightning rods by make metal tubes from sheet metal and wrapping the tubes around a central core
|SCHOONMAKER, John C.
||Lightning Rod Machine|
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