Station Systems, Key Telephone Units Circuits, Panel Mounted Units, SD-69288-01, 98 sheets
 (don't ask how to use these circuits, I don't know)

 201B fuse unit
 201C fuse unit
 202B cent off or pbx line ckt
 202C cent off or pbx line ckt
 202D cent off or pbx line ckt
 203A automatic tie line ckt
 204A ringdown tie line ckt
 205A station line ckt
 207B selector ckt
 208A cent off or pbx line ckts (3-ckts) with lamp flashing & incoming signal time-out ckt
 209A lamp flashing and time-out ckt
 210A wink ckt
 211A intercommunicating line ckt, ringing lamp ckt, noise suppression ckt and audible signal control ckt
 212A cent off or pbx line ckts (3-ckts) with lamp flashing & incoming signal time-out ckt
 213A joint use line ckt
 213B joint use line ckt
 214A signal talking link ckt with nine station signalling ckts
 214B signal talking link ckt with nine station signalling ckts
 215A station signalling ckt (single talking link) (3-ckts)
 216A transfer ckt
 216B transfer ckt
 217A preset conference ckt
 217B preset conference ckt and conference time-out ckt
 218A two and four-wire private line station ckt
 219A two and four-wire private line line ckt
 220A two and four-wire private line line, ringing relay or power supply ckt
 221A executive calling control and no-such-number circuit
 222A two talking-link ckt with nine station signalling ckts
 223A station signalling ckt (two talking links) (3 ckts)
 224A busy signal and camp-on control ckt
 224B busy signal and camp-on control ckt
 225A long line ckt
 226A inward conference control ckt
 226B inward conference control ckt
 227A common audible control ckt
 227B common audible control ckt
 228A blank unit (3 15/32 wide)
 229A auxiliary relay unit
 229B auxiliary relay unit
 230A cent off or pbx line ckt (4 ckts)
 230B cent off or pbx line ckt (4 ckts)
 231A line and conrtol ckt
 232A electro-mechanical flash, wink ring and time-out ckt
 232B electro-mechanical flash, wink ring and time-out ckt
 233A cent off or pbx line ckt (10 ckts)
 234A sel & transfer single link ckt (9 ckts)
 235A station line concentrator for 18 lines
 235B station line concentrator for 18 lines
 236A station line concentrator for 30 lines
 236B station line concentrator for 30 lines
 237A bridging ckt
 237B bridging ckt
 238A co or pbx line ckt (9 ckts)
 239A co or pbx line ckt (11 ckts)
 240A line transfer ckt
 240B line transfer ckt
 241A auxiliary line transfer ckt
 242A 4-wire line ckt (touch-calling sets)
 243A 4-wire line ckt (rotary dial sets)
 243B 4-wire line ckt (rotary dial sets)
 243C 4-wire line ckt (rotary dial sets)
 244A line transfer ckt
 245A attenuator pad
 246A cancelled
 247A touch-tone adapter, receiver, selector ckt
 247B touch-tone adapter ckt for operation with 207 or 407A selector, sub ckts
 248A 4-wire private line station ckt
 248B 4-wire private line station ckt
 249A co or line ckt (switching system no. 400)
 250A add-on ckt (switching system no. 400)
 251A ringup relay ckt
 252B tone cutoff and line current limiting ckt
 253A station selection ckt
 253B station selection ckt
 254A station selection ckt & amplifier ckt
 255A 4-wire line ckt
 256A active side-tone network for 4-wire lines
 257A cancelled
 258A line transfer ckt
 259A adapter unit
 259B adapter unit
 259C adapter unit
 260A multi-line exclusion ckt
 261A cancelled
 262A transfer ckt
 263A common visual and audible signalling control ckt
 264A cancelled
 265A blank unit with relay mountings