Pocket Watch Database
Patent Archive
#507549
Patent Information
Watch Balance Spring & Collet Combined
John Logan
October 31, 1893
Patent #507549
| Patent Number: | 507549 |
| Description: | Watch Balance Spring & Collet Combined |
| Inventor(s): | John Logan |
| Patent Date: | Oct 31, 1893 |
| Registration Type: | Patent |
| External Research: | https://www.google.c… |
| Patent Document: |
