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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 = '439') AND (category.subclass = '806') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '439'; Subclass is '806';

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T / S Patent Date Description Patentee Category Assigned To
 1939
U Specimen known 2,173,510 September 19, 1939 Conducting Holder for Luminous Tube Terminals
Neon terminal holder		 BELLOWS, Lewis F. R.
 Neon  

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