for supplying a selected one of a plurality of liquids or other fluent materials; or several in selected proportions; to a; spray apparatus, e.g. to a; single spray outlet
separate containers for different materials to be sprayed being moved from a first location, e.g. a filling station, where they are fluidically disconnected from the spraying apparatus, to a second location, generally close to the spraying apparatus, where they are fluidically connected to the latter
