| Business | Phone |
| C N Drilling 204 Nw 58th St, Seattle 98107 | (206) 706-8198 |
| C N Drilling 2808 9th Ave W, Seattle 98119 | (206) 286-8311 |
| Condon Johnson & Assoc 651 Strander Blvd 110, Seattle 98188 | (206) 575-8248 |
| Davies Drilling 15845 16th Ave Sw, Seattle 98166 | (206) 439-3234 |
| Drilling Unlimited Inc Seattle 98101 | (206) 762-1718 |