Attributions The files and metadata on this page have been mirrored with permission from The Telecom Archive. Bell System PracticesDivision818DescriptionEquipment Design and General Requirements - Engineering Information - No. 4 Type Toll Switching Systems Search Division: $attachmentPatent $attachmentPatent $attachmentPatent $attachmentPatent $attachmentPatent $attachmentPatent $attachmentPatent $attachmentPatent $attachmentPatent $attachmentPatent $attachmentPatent $attachmentPatent $attachmentPatent $attachmentPatent $attachmentPatent $attachmentPatent $attachmentPatent $attachmentPatent $attachmentPatent $attachmentPatent $attachmentPatent $attachmentPatent $attachmentPatent $attachmentPatent $attachmentPatent $attachmentPatent
