Maintaining telephone switches in the 1930s - photo

Maintaining electromechanical telephone switches at the Telephone Exchange Building, New York City. c. 1938.

Fullsize image: https://diqn32j8nouaz.cloudfront.net...aintenance.jpg
https://diqn32j8nouaz.cloudfront.net...e_exchange.jpg


Previously:

https://www.homemadetools.net/forum/...541#post162562
https://www.homemadetools.net/forum/...260#post130810
https://www.homemadetools.net/forum/...195#post103566

That's a number 5 crossbar switching system. I worked on them in the 1970's and they were in service well into the 1980's. They were used nationwide in telephone central offices.