| Business | Phone |
| Apex Construction Systems Inc 15930 Sw 72nd Ave, Portland 97224 | (971) 222-0006 |
| Seismic Components Llc 8900 Sw Burnham St # E15, Portland 97223 | (503) 670-7600 |
| Frontier Pacific 6130 N Marine Dr, Portland 97203 | (503) 285-6780 |
| Kaycan Limited 13122 Ne David Cir # 100, Portland 97230 | (503) 252-2953 |