Commonly used in testers and routiners.
GPO UAX13 Strowger Exchange - Machine, Pulsing and Ringing No. 2A
GENUINE GPO 205 RECTIFIER & 3.3K OHM RESISTOR (FOR GPO PHONE CONVERSIONS)
GPO KEYSENDER No. 5 (KEYCALLER) For GPO TELEPHONE EXCHANGE?
GB GPO Official TELEGRAPHS Cover 1901 Woolwich Application OHMS Letter T118a
GPO Bakelite Headphones Vintage
Vintage 1970s GPO 741 Wall Mounted Dial Telephone - Untested - Spares / Repair
