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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 = '248') AND (category.subclass = '69') ORDER BY date ASC, patent, type

Total of 3 patents found where: Class is '248'; Subclass is '69';

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T / S Patent Date Description Patentee Category Assigned To
U Specimen known 316,812 April 28, 1885 Telegraph Insulator
CD 119, self-tying via projections (347,635 more appropriate)
Insulator William Brookfield
U Specimen known 427,296 May 6, 1890 Insulator
CD 141.8 and CD 1037, self-tying with tapered pin hole & clamping flange
BUZBY, Joseph F.
U Specimen known 2,444,938 July 13, 1948 Insulator
Radio antennae insulator with center hole for nail and side slits to hold the antennae wire
MARTIN, JR., Albert D.

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