| Business | Phone |
| Detronic Technical Corp 329 Barbey St, Brooklyn 11207 | (718) 235-5277 |
| E Greene Tech Co 789 Macdonough St, Brooklyn 11233 | (718) 919-1113 |
| Benjamin G Shafiroff 2202 Quentin Rd, Brooklyn 11229 | (718) 339-3888 |
| Polytech U-Computer Science 6 Metrotech Ctr, Brooklyn 11201 | (718) 260-3440 |