PROMOTIONAL SERVICES AMONG MEMBERS OF THE ASSOCIATION AND OTHERS ENGAGED IN THE BUSINESS OF MERCHANDISING AND SERVICING OF APPLIANCE, RADIO, AND TELEVISION EQUIPMENT-NAMELY, THE PREPARATION AND DISTRIBUTION AMONG THE MEMBERS OF THE ASSOCIATION OF PROMOTIONAL INFORMATION AND SUGGESTIONS RELATING TO THEIR BUSINESS; AND THE PREPARATION AND DISSEMINATION OF ADVERTISING AND PUBLICITY MATERIAL TO ACQUAINT THE PUBLIC WITH THE PRINCIPLES AND AIMS OF THE MEMBERS OF THE ASSOCIATION