Safeway Inc. takes the mystery out of making ice cream. At its Bellevue, Wash., ice cream plant, silos, pasteurizers, stainless steel tubing, flavor vats, fillers and other equipment are all labeled as to their contents or function. There is even a label above a hand-crank pencil sharpener. That was put there either for the benefit of a younger generation raised on hand-held devices (instead of pencil and paper) or else it was an expression of an engineer’s sense of humor.