Pocket Watch Database
Patent Archive
#403211
Patent Information
Watch Magnetic Shield
Harry Pratt
May 14, 1889
Patent #403211
| Patent Number: | 403211 |
| Description: | Watch Magnetic Shield |
| Inventor(s): | Harry Pratt |
| Patent Date: | May 14, 1889 |
| Registration Type: | Patent |
| External Research: | https://www.google.c… |
| Patent Document: |
