Aggregates Manager - May 4, 2010 Modular Valves Keep the Powder Flowing on Marble Hill
Biomass Magazine - February 2010 Issue Colmac Energy's Secret to Success: Reliability and Maximum Uptime
Powder and Bulk Engineering - July 1999 Issue "Rotary valves keep on turnin'"
Powder and Bulk Engineering "Rotary valve return on investment: Doing the math"