Vintage Global Computer Supplies DT-4 EIA CCITT Modem Terminal Interface W/ Bag

International Data Sciences Model 60 EIA Interface Monitor and Breakout Panel

Global Computer Supplies DT-4 EIA CCITT Modem Terminal Interface Unit Vintage

Beckman Industrial Easy Bob Model 720. Modem-Terminal Interface

Datacom Technologies X.21/RS422/CCITT/V.11/X.27 Breakout Box w/ RS- 232 Monitor

Black Box Model 355 CCITT V.35 Breakout & Activity Tester with Leather Case

International Data Sciences Model 60 EIA Interface Monitor and Breakout Panel

International Data Sciences Model 60 EIA Interface Monitor and Break Out Box