Pocket Watch Database
Patent Archive
#1393447
Patent Information
Timer Electric Circuit
Svend Johnsen
October 11, 1921
Patent #1393447
| Patent Number: | 1393447 |
| Description: | Timer Electric Circuit |
| Inventor(s): | Svend Johnsen |
| Patent Date: | Oct 11, 1921 |
| Registration Type: | Patent |
| External Research: | https://www.google.c… |
| Patent Document: |
