| October 10, 1923 | Edgar. F. Johnson forms a mail order business in Waseca, Minnesota |
| 1997 | Purchased by Transcrypt International |
| 2005 | Headquarters relocated to Irving, Texas |
| 2008 | Renamed E.F. Johnson Technologies |
| 2010 | Purchased by private equity fund Francisco Partners |
| 2014 | Purchased by JVC Kenwood |
|