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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 = '122') AND (category.subclass = '23') ORDER BY specimen ASC, date, patent, type

Total of 2 patents found where: Class is '122'; Subclass is '23';

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T / S Patent Date Description Patentee Category Assigned To
 1907
U 866,787 September 24, 1907 Furnace
Producer gas furnace combined with boiler		 HEMINGRAY, Ralph G.
JENSEN, John O.
 HI  
 1919
U Specimen known 1,304,623 May 27, 1919 Glass
Boro-silicate glass (Corning Pyrex glass)		 SULLIVAN, Eugene C.
TAYLOR, William C.
 Boron Corning Glass Works

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