Self Winding Master Clocks in Central Offices
23:18
How many different ways can we cause trouble in the 5XB?
8:31
The Underground Clocks of Paris
4:50
What the heck is a self-winding clock?
19:03
The Machine that Makes Your Phone Ring
9:27
Standard Electric Time Master Clock Operation
10:39
The Last Towns to Use Operators to Connect Calls - AT&T Archives
8:05
Western Union Self Winding Pendulum Clock
12:14