G.P.O. GMT 34 and Clock 36
5:06
GPO Master clock 36 & Slave clocks system
10:56
Strowger CAA-61-stara Centrala telefoniczna old exchange
17:16
Electric master clocks
8:57
Dennehys Cross Ericsson ARF Crossbar Telephone Exchange
30:01
Correctly hanging a GPO clock No 36
3:06
Strowger Step-by-step Demonstration
11:33
The Electromechanical Pendulum of the 36 Master Clock
9:02