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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 = '279') AND (category.subclass = '104') ORDER BY date ASC, patent, type

Total of 2 patents found where: Class is '279'; Subclass is '104';

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T / S Patent Date Description Patentee Category Assigned To
 1875
U 170,377 November 23, 1875 Improvement in Lightning Rods
Coupling for hollow lightning rods composed of a hollow indented plug that fits into indentions in the rod ends		 JOHNSON, Isaac
 Lightning Rod Coupling  
 1876
U 173,962 February 22, 1876 Improvement in Couplings for Tubing and Lightning Rods
Coupling made of a short hollow piece placed inside both ends of the rod and crimped down through the rod ends to secure the sections		 JOHNSON, Isaac
 Lightning Rod Coupling Reyburn, Hunter & Co.

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