Exhibit 21
| Subsidiaries of the Registrant | ||
| Entity Name | Organized Under Laws of | |
| Strong Technical Services, Inc. | Nebraska | |
| Strong/MDI Screen Systems, Inc. | Quebec, Canada | |
| SDM Holdco, Inc. | Delaware | |
| Digital Ignition, LLC | Georgia | |
| Strong Studios, Inc. | Delaware | |
| Strong Westrex, Inc. | Nebraska | |