Pocket Watch Database
Patent Archive
#360234
Patent Information
Watch Balance & Hair Spring Test & Grade
Duane H. Church
John Logan
March 29, 1887
Patent #360234
| Manufacturer: | Waltham |
| Patent Number: | 360234 |
| Description: | Watch Balance & Hair Spring Test & Grade |
| Inventor(s): |
Duane H. Church John Logan |
| Patent Date: | Mar 29, 1887 |
| Registration Type: | Patent |
| External Research: | https://www.google.c… |
| Patent Document: |
