Abstract: Fire fighting apparatus using a single pressurizing pump and an improved eductor venturi to enable the in-line eduction of a long term fire retardant concentrate into a pressurized diluting water flow stream downstream of the water pressurizing pump so that the resulting mixture of water and liquid concentrate is accurately proportioned to meet a specification dictated by the concentrate vendor and is thus instantly available for application to fire threatened structures and vegetation.

Abstract: A central station blocks calls for a subscriber. The central station receives a call from a caller and provides an audio message to the caller requesting that the caller provides a first indicator if the caller is an unwanted caller or a second indicator otherwise. The central station receives the first indicator or the second indicator. If the central station receives the first indicator, the call is blocked. If the central station receives the second indicator, the call is passed through.