| Business | Phone |
| Nye's Machine & Design 1153 Roush Rd, Hummelstown 17036 | (717) 533-9514 |
| Whitehaus Precision Machine 1294 Sand Beach Rd, Hummelstown 17036 | (717) 533-1652 |
| Venture Precision Tool 241 E 2nd St, Hummelstown 17036 | (717) 566-6496 |
| Rbs Fab Inc 230 Hoernerstown Rd, Hummelstown 17036 | (717) 566-9513 |