| 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 = '191') AND (category.subclass = '23R') ORDER BY date ASC, patent, type |
Total of 2 patents found where: Class is '191'; Subclass is '23R';
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| T / S | Patent | Date | Description | Patentee | Category | Assigned To |
| 1889 | ||||||
| U | 402,836 | May 7, 1889 | Insulator and Holder for Electric Railways Third rail insulator clamps the rail upsidedown. |
JENNINGS, Byron |
Third Rail | |
| 1893 | ||||||
| U | 503,039 | August 8, 1893 | Conductor Support and Insulator miscellaneous wire support for underground trolley wire & insulator with hole in crown |
ESSICK, William B. |
Miscellaneous | |
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