Pennsylvania
| Company | Category | Area | Address | Web | Contact person | |
| TESTING SERVICES INC | Radon Testing & Correction | Pennsylvania | 1844 SWATARA ST, HARRISBURG, Dauphin, Pennsylvania, 17104-1255, USA | - | - | Thomas Poole |
| TESTWARE INC | Computer Software | Pennsylvania | 1976 E HIGH ST, POTTSTOWN, Montgomery, Pennsylvania, 19464-3277, USA | - | - | - |