Pocket Watch Database
Patent Archive
#861990
Patent Information
Machine Watch Clean
Elmer F. Knowles
July 30, 1907
Patent #861990
| Patent Number: | 861990 |
| Description: | Machine Watch Clean |
| Inventor(s): | Elmer F. Knowles |
| Patent Date: | Jul 30, 1907 |
| Registration Type: | Patent |
| External Research: | https://www.google.c… |
| Patent Document: |
