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Jefferson Barracks Telephone Museum, St. Louis, Mo. - Step-by-Step Central Office Switch The Strowger switch was the first commercially successful electromechanical stepping switch telephone exchange system. The device was invented by an
PBX Telephone Line Switch - Model PBX | Inovonics Broadcast, Inc.
A telephone switch board is a telecommunications system used in the public switched telephone network to establish telephone calls between subscribers Stock Photo - Alamy
A message for today from last century's vast telephone exchanges | New Scientist
Old Telephone Connection Panel In Telephone Exchange Close Up Stock Photo, Picture and Royalty Free Image. Image 146076520.
The Center - Innovation By Problem Solving
Telephone switch hi-res stock photography and images - Alamy