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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 = '29') AND (category.subclass = '557') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '29'; Subclass is '557';

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T / S Patent Date Description Patentee Category Assigned To
 1922
U 1,413,023 April 18, 1922 Method and Means for Forming Passages in Plastic Material
Suspension Hewlett design, method of cutting ring hole		 GOUVERNEUR, Minor F. H.
 Suspension Locke Insulator Corp.

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