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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 = '470') AND (category.subclass = '51') ORDER BY date ASC, patent, type

Total of 2 patents found where: Class is '470'; Subclass is '51';

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T / S Patent Date Description Patentee Category Assigned To
 1919
U 1,314,682 September 2, 1919 Spur Forming Machine
Machine for making nail-knobs (see 1,517,084)		 MCKNIGHT, Oscar W.
 Knob Brunt Tile & Porcelain Co.
 1924
U 1,517,084 November 25, 1924 Spur Forming Machine
Machine for making nail-knobs (see 1,314,682)		 MCKNIGHT, Oscar W.
 Knob Brunt Tile & Porcelain Co.

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