Pocket Watch Database
Patent Archive
#984191
Patent Information
Timer Electric Circuit
Charles E. Campbell
February 14, 1911
Patent #984191
| Patent Number: | 984191 |
| Description: | Timer Electric Circuit |
| Inventor(s): | Charles E. Campbell |
| Patent Date: | Feb 14, 1911 |
| Registration Type: | Patent |
| External Research: | https://www.google.c… |
| Patent Document: |
