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March 6, 2018 all-day
On this evening 150 ladies and gentlemen at the Detroit Club listened to a live concert in Chicago via telephone. Elisha Grey, electrician from the Western Telegraphic Manufacturing Company of Chicago, arranged the demonstration. The previous longest transmission was 84 miles. The one at the Detroit Club covered a distance of 284 miles.
“Musical Lightning”, Detroit Free Press, March 7, 1877, column 6.