Division 950: General Descriptive Information (pre-1960)

Section Date Issue Size Title
950.703.011957-09-0111.75 MBSchematic Symbols for Attached-Contact Drawings
971.501.011954-02-01133.97 MBGeneral Description - No. 5 Crossbar System
986.100.051958-01-0111.43 MBPrivate Service Systems - A1 Digital Data Signaling System - Data Testboard and Associated Circuits
991.006.011960-03-0111.50 MBPBX Systems - Range Chart - Trunk and Station Conductor Loop Ranges for PBXs Connected To No. 1 Crossbar Central Offices Having 1300-Ohm Subscriber Conductor Loop - 400-Ohm Talking Battery Feed Circuit - AC-DC or Superimposed Ringing (84-88V AC Component) - Office Voltage of 48V (Floating)
991.006.041960-05-0111.12 MBPBX Systems - Range Chart - Trunk and Station Conductor Loop Ranges for PBXs Connected To Panel Central Offices Having 635-Ohm Subscriber Conductor Loop - 50-Ohm Talking Battery Feed Circuit - AC-DC or Superimposed Ringing (72, 80, or 84 Volts Minimum AC Component) - Minimum Office Voltage of 21V (Floating)
991.102.021960-02-0115.37 MB608A Private Branch Exchange - General Description
993.002.011959-03-0111.23 MBStation Systems - No. 300 Switching System
993.003.011959-03-0111.41 MBNo. 153A Amplifier For Use With Head Telephone Sets
993.201.011958-06-0114.47 MBEmergency Reporting System - 520-Type PBX - Direct Line Systems
993.201.0214.66 MBEmergency Reporting System - 520-Type PBX - Concentrator System
993.301.011957-08-0113.84 MBSC2 Selective Control System
993.402.011958-02-0111.56 MBCommon User Group Equipment - Air-Ground Voice Communications System - Private Service Systems
993.409.011959-10-1511.29 MBGeneral Description of SS1 Selective Signaling Systems