| 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 = '340') ORDER BY date ASC, patent, type |
Total of 3 patents found where: Class is '340';
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| T / S | Patent | Date | Description | Patentee | Category | Assigned To |
| 1872 | ||||||
| U | 127,041 | May 21, 1872 | Improvement in Fire Alarm Signal Boxes Design for a fire alarm signal box |
FLOYD, George |
Fire Alarm | |
| 1887 | ||||||
| U | 362,477 | May 3, 1887 | Electric Police Call Alarm Box Police call alarm box with a key |
COUGHLIN, John J. |
Alarm Box | 3/4 to Hern, Prendergast, Oakman |
| 1934 | ||||||
| U | 1,976,378 | October 9, 1934 | Aviation Marker Aviation warning light attached to a suspension insulator |
VROOMAN, Edward C. |
Misc | Locke Insulator Corp. |
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