Pocket Watch Database
Patent Archive
#524386
Patent Information
Recorder Electric Circuit
Harry T. Johnson
August 14, 1894
Patent #524386
| Patent Number: | 524386 |
| Description: | Recorder Electric Circuit |
| Inventor(s): | Harry T. Johnson |
| Patent Date: | Aug 14, 1894 |
| Registration Type: | Patent |
| External Research: | https://www.google.c… |
| Patent Document: |
