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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 = '156') AND (category.subclass = '89.12') ORDER BY date ASC, patent, type

Total of 3 patents found where: Class is '156'; Subclass is '89.12';

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T / S Patent Date Description Patentee Category Assigned To
 1915
U 1,164,739 December 21, 1915 Method of Making Insulating Devices
Manufacturing technique to make long bushings with petticoats by stacking them on a fired core and fusing the petticoats to the core		 MERSHON, Ralph D.
 Manufacturing  
 1922
U Specimen known 1,431,137 October 3, 1922 Joint for Articles of Ceramic and Similar Materials and Method of Producing Same
Multipart joined by sand, glaze-welding and/or differential shrinkage		 AUSTIN, Arthur O.
 Multipart The Ohio Brass Co.
 1941
U 2,234,391 March 11, 1941 Method of Manufacturing Electric Insulators
Method of making station post insulators with metal caps		 TAYLOR, John J.
 Insulator The Ohio Brass Co.

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