Pocket Watch Database
Patent Archive
#879540
Patent Information
Recorder Speed & Time
Edwin J. Hall
February 18, 1908
Patent #879540
| Patent Number: | 879540 |
| Description: | Recorder Speed & Time |
| Inventor(s): | Edwin J. Hall |
| Patent Date: | Feb 18, 1908 |
| Registration Type: | Patent |
| External Research: | https://www.google.c… |
| Patent Document: |
