| Business | Phone |
| Tech Skill Inc 8003 Queenair Dr, Gaithersburg 20879 | (301) 948-7752 |
| Prototype Productions 8000 Cessna Ave, Gaithersburg 20879 | (301) 977-0626 |
| Nicholson Precision Instrument 7851 Beechcraft Ave, Gaithersburg 20879 | (301) 840-0370 |
| M & T Precision Machining Inc 42 Cessna Ct, Gaithersburg 20879 | (301) 990-3727 |
| Ideal C & C Machining 7800 Airpark Rd, Gaithersburg 20879 | (301) 869-6346 |