Exhibit 21.1
Subsidiaries of the Registrant
| Subsidiary | Jurisdiction of Incorporation or Organization | |
|
SG Building Blocks, Inc. |
Delaware | |
| SG Residential, Inc. | Delaware | |
| SG Echo, LLC | Delaware | |
| Clarity Mobile Venture, LLC | Delaware | |
| Chicago Airport Testing, LLC | Delaware | |
| SGB Development Corp. | Delaware |