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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 = '356') AND (category.subclass = '426') ORDER BY date ASC, patent, type

Total of 2 patents found where: Class is '356'; Subclass is '426';

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T / S Patent Date Description Patentee Category Assigned To
 1949
U 2,468,663 April 26, 1949 Article Illuminating Inspection Device For Amber Glass Insulators and Other Hollow Dense Walled Articles of Low Transparency
Insulator inspection device for dark amber insulators		 GREEN, Thomas D.
 Manufacturing Hartford-Empire Co.
 1951
U 2,552,522 May 15, 1951 Device for Inspecting Transparent Threaded Glass Articles Such as Insulators
Insulator inspection device for dark amber insulators		 COUNSELLOR, JR., Edward D.
 Manufacturing Armstrong Cork Co.

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