| Business | Phone |
| Aircraft Standards Inc 4241 24th Ave W, Seattle 98199 | (206) 284-6061 |
| B & D Sheet Metal 16715 Aurora Ave N, Seattle 98133 | (206) 523-8982 |
| Ballard Sheet Metal Works Inc 4763 Ballard Ave Nw, Seattle 98107 | (206) 784-0545 |
| J & R Metal Craft Inc 15 Nickerson St, Seattle 98109 | (206) 284-0632 |