| Business | Phone |
| Acorn Data Systems Inc 5713 Harpers Farm Rd, Columbia 21044 | (410) 715-0633 |
| Cengen Consultanting & Engnr 6681 Buttonhole Ct, Columbia 21044 | (410) 715-1300 |
| Rhintek Inc 8835 Columbia 100 Pkwy # C, Columbia 21045 | (410) 730-2575 |
| Rohbe Inc 10037 Evergreen Ave, Columbia 21046 | (410) 715-0663 |