https://4thefirsttime.blogspot.com/2007/06/1878-first-telephone-switchboard-first.html
For The First Time (or the last time): 1878: first telephone switchboard1878: first telephone...
On January, 28 1878, the first commercial switchboard began operating in New Haven, Connecticut. It served 21 telephones on 8 lines, so many...
for the first timelasttelephone