| Business | Phone |
| Clowers Engineering Co 1505 Sw 104th St, Oklahoma City 73159 | (405) 691-8024 |
| Coon Engineering Inc 2832 W Wilshire Blvd # 202, Oklahoma City 73116 | (405) 842-0363 |
| Crafton Tull & Assoc 235 N Macarthur Blvd, Oklahoma City 73127 | (405) 787-6270 |
| W2m Consulting Llc 2932 Nw 122nd St # 23, Oklahoma City 73120 | (405) 749-2228 |
| Thurman Engineering 4308 Clendon Way, Oklahoma City 73115 | (405) 672-5050 |