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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 = '425') AND (category.subclass = 'DIG.35') ORDER BY date ASC, patent, type

Total of 2 patents found where: Class is '425'; Subclass is 'DIG.35';

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T / S Patent Date Description Patentee Category Assigned To
U 474,496 May 10, 1892 Apparatus for Molding Earthenware, &c.
Press to form lateral indentions or wire grooves around the side of the insulator to such as for standard porcelain knobs
U 2,415,462 February 11, 1947 Ceramic Molding Press
Vacuum molding of clay articles such as insulators. This may be the patent used by Locke to make their ""vacuum dry pressing"" porcelain insulators.
CHERRY, George L.
VEALE, Charles C.
Press Western Electric Co.

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