Pocket Watch Database
Patent Archive
#406655
Patent Information
Watch Balance & Hair Spring Apparatus Test
John Logan
July 9, 1889
Patent #406655
| Patent Number: | 406655 |
| Description: | Watch Balance & Hair Spring Apparatus Test |
| Inventor(s): | John Logan |
| Patent Date: | Jul 9, 1889 |
| Registration Type: | Patent |
| External Research: | https://www.google.c… |
| Patent Document: |
