Pocket Watch Database
Patent Archive
#1978825
Patent Information
Convex Crystal And Method Of Make Same
Henry Otto Vogt
October 30, 1934
Patent #1978825
| Patent Number: | 1978825 |
| Description: | Convex Crystal And Method Of Make Same |
| Inventor(s): | Henry Otto Vogt |
| Assignee: | E Ingraham Co |
| Patent Date: | Oct 30, 1934 |
| Registration Type: | Patent |
| External Research: | https://www.google.c… |
| Patent Document: |
