Fiber Preparation and Processing Machinery and Complete Processing Systems from West Salem Machinery (WSM) produce feedstock for ethanol, biofuels, pellets/densifiied fuels, co-firing, and biomass power. Grinders, Shredders, Hammermills, Feeders, Pre and Post Screeners, De-Stringers and Size Reduction Equipment for Baled Ag Fiber. WSM is a leading manufacturer of size reduction and screening equipment with over 74 years of experience and installations worldwide.