| Business | Phone |
| A & F Machine & Development 129 Sandy Dr, Newark 19713 | (302) 368-4303 |
| Allied Precision 12 Mill Park Ct # C, Newark 19713 | (302) 731-1388 |
| Black Stallion Machine Works 303 Markus Ct # A, Newark 19713 | (302) 454-8652 |
| Joe Martin Machine Tool Co 1901 Ogletown Rd, Newark 19711 | (302) 368-0644 |
| M & M Instrument Makers Inc 401 Bellevue Rd, Newark 19713 | (302) 368-8946 |
| Polarstar Engineering/Machine 5 Garfield Way, Newark 19713 | (302) 368-4639 |
| Potts Welding Inc 1901 Ogletown Rd, Newark 19711 | (302) 453-2550 |
| Prototek Machining & Dev 307a Markus Ct, Newark 19713 | (302) 368-1226 |
| Summit Industrial Corp 1109 Elkton Rd, Newark 19711 | (302) 368-2718 |
| Rohm & Haas Electronic 361 Bellevue Rd, Newark 19713 | (302) 283-2100 |