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First Panel System in NYC

The Panel telephone exchange is the grandaddy of all electromechanical exchanges for large metro environments. It defined the basic requirements for successor systems. Sure, follow-on systems would implement things differently but the basic ideas could be seen in bones of the Panel system.

The first 7-digit Panel system was installed in NYC, October 1922. Check out this article for more on the 100th anniversary of the installation.  

panel telephone exchange image showing selector
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