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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 = '174') AND (category.subclass = '138A') ORDER BY date ASC, patent, type

Total of 1 patents found where: Class is '174'; Subclass is '138A';

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T / S Patent Date Description Patentee Category Assigned To
 1933
U 1,937,964 December 5, 1933 Insulator Support for Tower or Mast Type Antenna
Insulator for supporting radio tower or mast antenna		 JENNER, Ralph L.
 Antenna Lapp Insulator Co., Inc.

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