Model 355 CCITY V.35 BREAKOUT And ACTIVITY TESTER

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

Datacom Technologies 355 CCITT v.35 Tri-State Breakout Box & Activity Tester

RS-232 Breakout Box Interface Tester w/ Ribbon Cable Jumpers DB2

Vintage 1985 Multi-Tech Systems RS-232 Break-Out Box MT25 EIA/CCITT

BLACK BOX TS291A SAM V.35 Breakout Activity CCITT I/O Tester

RS-232 Breakout Box Interface Tester w/ Ribbon Cable Jumpers DB2

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