Pocket Watch Database
Patent Archive
#872430
Patent Information
Clock & Call System
Frederick I. Johnson
December 3, 1907
Patent #872430
| Patent Number: | 872430 |
| Description: | Clock & Call System |
| Inventor(s): | Frederick I. Johnson |
| Patent Date: | Dec 3, 1907 |
| Registration Type: | Patent |
| External Research: | https://www.google.c… |
| Patent Document: |
