| Business | Phone |
| Terra Technologies Inc 907 Fee Fee Rd, Maryland Heights 63043 | (314) 434-1550 |
| Prudent Technologies Inc 11850 Dorsett Rd, Maryland Heights 63043 | (314) 209-9600 |
| Chemir Analytical Svc Inc 2661 Metro Blvd, Maryland Heights 63043 | (314) 344-8814 |