|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 = '181') AND (category.subclass = '138') ORDER BY date ASC, patent, type|
Total of 1 patents found where: Class is '181'; Subclass is '138';
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|T / S||Patent||Date||Description||Patentee||Category||Assigned To|
|U||296,330||April 8, 1884||Insulator for Line Wires of Mechanical Telephones
Non-electrical (!!) insulator to suspend wires of mechanical telephones!!!
|GILLILAND, James F.
||Non-electrical||John Bennet and August Meyer|
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