Pocket Watch Database
Patent Archive
#197430
Patent Information
Watch Escape
John Thomson
November 20, 1877
Patent #197430
| Patent Number: | 197430 |
| Description: | Watch Escape |
| Inventor(s): | John Thomson |
| Patent Date: | Nov 20, 1877 |
| Registration Type: | Patent |
| External Research: | https://www.google.c… |
| Patent Document: |
