The gentleman who originated exchanges for the telephone came up with the invention in 1891. He believed customers should have the ability to call other subscribers instead of operators. He was an undertaker at the time. The wife of his competition was a regular Harriet Oleson on the switchboard. She gave the undertaking business to her husband. He was unhappy to hear that. Pissed really. Read more here. (http://en.m.wikipedia.org/wiki/Almon_Brown_Strowger) Almon Brown Strowger.
Here is a dedicated page to manual relay for telephones. (http://www.technology.niagarac.on.ca/staff/mcsele/TelephoneSwitch.html)
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