Abstract: A dispenser for mixing and dispensing a liquid chemical concentrate with a dilutent from a container. The dispenser includes two slideable eductors one of which is also rotatable. Both a high and low flow rate can be obtained with simultaneous adjustment of concentration of the chemical concentrate. The dispenser has a high degree of accuracy of the amount of dilution of the chemical concentrate as well as positive positioning of the high and low flow rate.

Abstract: A dispatch hub includes a hub processor and a communications device for communicating with a plurality of field assemblies, which typically are installed in mobile service vehicles. Each field assembly includes a wireless communication device for communicating with the dispatch hub, a geographic positioning device, an RFID reader for reading RFID tags associated with components in the inventory of a service vehicle, and a controller for controlling the collection of field data at the field assembly and forwarding of field data to the dispatch hub. Field data include at least information about the geographic location of the field assembly and component identification data. At the dispatch hub, the need for a specific component at a customer site and the geographic location of the customer site are compared with the forwarded field data to select a service vehicle to travel to the customer site with a needed component.