| Business | Phone |
| Structural Integrity Engnrng 9700 Harbour Pl 217, Mukilteo 98275 | (425) 493-2828 |
| Custom Design & Engineering 11006 60th St Ave W, Mukilteo 98275 | (425) 493-8220 |
| D 3 Technologies 8223 44th Ave W G, Mukilteo 98275 | (425) 355-4903 |
| Slope Indicator 12123 Harbour Reach Dr 106, Mukilteo 98275 | (425) 806-2200 |