link | bell_system, d4, telecom | Tue Feb 15 20:15:03 EST 2022 link | bell_system, d4, telecom | Tue Feb 15 20:12:24 EST 2022 link | backplane, d4, telecom, wires | Sat Aug 7 21:40:49 EDT 2021 link | d4, fans, telecom | Fri Dec 22 23:39:51 EST 2017 link | d4, ladders, telecom | Wed Nov 8 20:36:56 EST 2017 link | d4 | Fri Apr 21 11:26:24 EDT 2017