Attributions The files and metadata on this page have been mirrored with permission from The Telecom Archive. Bell System PracticesDivision546Description740-Type PBX Search Division: $attachmentPatent $attachmentPatent $attachmentPatent $attachmentPatent $attachmentPatent $attachmentPatent $attachmentPatent $attachmentPatent $attachmentPatent $attachmentPatent $attachmentPatent $attachmentPatent $attachmentPatent $attachmentPatent $attachmentPatent $attachmentPatent $attachmentPatent $attachmentPatent
