| Business | Phone |
| Yardley Group Inc 133 S 36th St, Philadelphia 19104 | (215) 387-5564 |
| Human Designed Systems Inc 3440 Market St, Philadelphia 19104 | (215) 382-5001 |
| T & G Assoc Inc Western Savings Bank Bldg, Philadelphia 19103 | (215) 545-0959 |
| United Telcom Computer Group 2300 Walnut St, Philadelphia 19103 | (215) 568-2424 |