| Business | Phone |
| Getco Laboratories 104 Nw Kendall Ave, Topeka 66606 | (785) 232-3304 |
| M D Chemical & Testing Co Inc Forbes Field # 281, Topeka 66619 | (785) 862-3500 |
| Mannell & Assoc 1200 Sw 20th St, Topeka 66604 | (785) 234-4542 |
| Material Testing Spec Inc Po Box 19067, Topeka 66619 | (785) 862-0223 |