Pocket Watch Database
Patent Archive
#342917
Patent Information
Machine Watch Main Spring
John Logan
June 1, 1886
Patent #342917
| Patent Number: | 342917 |
| Description: | Machine Watch Main Spring |
| Inventor(s): | John Logan |
| Patent Date: | Jun 1, 1886 |
| Registration Type: | Patent |
| External Research: | https://www.google.c… |
| Patent Document: |
