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 = '425') AND (category.subclass = '263') ORDER BY specimen DESC, date, patent, type |
Total of 2 patents found where: Class is '425'; Subclass is '263';
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T / S | Patent | Date | Description | Patentee | Category | Assigned To |
1928 | ||||||
U | 1,677,498 | July 17, 1928 | Apparatus for Undercutting Pinholes in the Center Shells of Insulators Machine to undercut the pinhole for the suspension pin to prevent the pin from pulling out of the insulator. |
SMITH, William Henry |
Suspension | Electric Service Supplies Co. |
1929 | ||||||
U | 1,732,339 | October 22, 1929 | Apparatus for Finishing Insulator Shells Machine to form the opening in the bottom of a top shell and form grooves in the sides of the opening to aid in cement adhesion between the top shell and the second shell. |
OSBORNE, David H. |
Manufacturing | Electric Service Supplies Co. |
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