Pocket Watch Database
Patent Archive
#392442
Patent Information
Watch Balance Wheel Ascertain Expand
John Logan
November 6, 1888
Patent #392442
| Patent Number: | 392442 |
| Description: | Watch Balance Wheel Ascertain Expand |
| Inventor(s): | John Logan |
| Patent Date: | Nov 6, 1888 |
| Registration Type: | Patent |
| External Research: | https://www.google.c… |
| Patent Document: |
