Abstract: System and method for comminuting gypsum wallboard received from a series of processing hoppers and milling hoppers by discharge into an assembly including a feed hopper, a barrel and trommel screen assembly for separation and final removal of paper and non-ferrous materials from comminuted gypsum wallboard, and separate assembly for receiving and conveying processed barrel screen discharge waste and gypsum.

Abstract: Apparatus for supporting a fluent material conduit includes a plurality of support units having different sizes. Each support unit includes two support members pivotally attached to one another at one end thereof and having a concavity at the other end thereof for receiving a conduit. The apparatus also includes a lock for locking the support members against relative pivotal movement to retain the upper ends of the support members a desired distance from one another.

Abstract: Portable apparatus for comminuting gypsum wallboard includes a rigid truck trailer platform having two hoppers mounted thereon. Rotary milling units are in one hopper and a chain mill in the other hopper. Wallboard is sequentially passed through the hoppers and a conveyor transports wallboard between the hoppers.