Pocket Watch Database
Patent Archive
#704874
Patent Information
Clock Escape Electro Magnetic
Hubert Henry Grenfell
July 15, 1902
Patent #704874
| Patent Number: | 704874 |
| Description: | Clock Escape Electro Magnetic |
| Inventor(s): | Hubert Henry Grenfell |
| Patent Date: | Jul 15, 1902 |
| Registration Type: | Patent |
| External Research: | https://www.google.c… |
| Patent Document: |
