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The traditional functions of protective signaling are being expanded to include a wide range of audible and visual signaling systems which are being applied to the new demands of the high-density modern building complex. The needs for security protection could complement the fire protection needs. Fire-immune radio-transmission links equivalent to traditional wire links could replace many of the wire links. Audio-visual appliances, television, and film cameras could become standard appliances for protective systems. The superior information conveyance of light over sound, especially for those with hearing impairment is the basis for visual signaling appliances which could supplement audible appliances. (Copyright (c) 1976, Society of Fire Protection Engineers, Boston, Mass.)