Pocket Watch Database
Patent Archive
#105467
Patent Information
Watch Hair Spring Test Apparatus
John Logan
July 19, 1870
Patent #105467
| Patent Number: | 105467 |
| Description: | Watch Hair Spring Test Apparatus |
| Inventor(s): | John Logan |
| Patent Date: | Jul 19, 1870 |
| Registration Type: | Patent |
| External Research: | https://www.google.c… |
| Patent Document: |
