Tester set No. 89A, 1931
1931
Switchboard operator's breastplate headset
Filter unit WB 400A for the UK early warning system from voice telephone signals
Cable over-floor protector
Bag of telephone exchange power board engraved labels
Tester No 89A, c.1930
Switchboard operator's breastplate headset
Echo Suppression Rack
1960
Tester No. 106 heat coil and fuse
Telephone Repeater Rack
circa 1960