Pocket Watch Database
Patent Archive
#1490740
Patent Information
Clock Control Electric Device Signal
J. F. Hielscher
May 15, 1924
Patent #1490740
| Patent Number: | 1490740 |
| Description: | Clock Control Electric Device Signal |
| Inventor(s): | J. F. Hielscher |
| Patent Date: | May 15, 1924 |
| Registration Type: | Patent |
| External Research: | https://www.google.c… |
| Patent Document: |
