Pocket Watch Database
Patent Archive
#1813942
Patent Information
Frequency Indicate
Ralph E. Malles
July 14, 1931
Patent #1813942
| Patent Number: | 1813942 |
| Description: | Frequency Indicate |
| Inventor(s): | Ralph E. Malles |
| Assignee: | Bell Telephone Laboratory Inc |
| Patent Date: | Jul 14, 1931 |
| Registration Type: | Patent |
| External Research: | https://www.google.c… |
| Patent Document: |
