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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 = '385') ORDER BY date ASC, patent, type

Total of 3 patents found where: Class is '425'; Subclass is '385';

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T / S Patent Date Description Patentee Category Assigned To
U Specimen known 1,407,550 February 21, 1922 Method and Machine for Forming Impressions in Plastic Articles
Threading porcelain by gyrating the thread mandrel (""wobbler"" method)
LAPP, John
U 1,689,073 October 23, 1928 Indenting Tool
Tool used to roll across the surface of a clay insulatot to form indentions or a rough surface to produce a better griping surface for cement.
HARVEY, William F.
U 1,731,099 October 8, 1929 Method of Forming a Cement-Receiving Surface on an Insulator Section
Improve cement adhesion by using a special roller tool to form a rough surface similar to that obtained by sanding.
HARVEY, William F.

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