Word: quadruplex
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...over the U.S. and Canada as a "boomer," or tramp telegrapher. When I hit Detroit, Tom Edison was in New York working the first Albany circuit at 195 Broadway. When I hit 195 Broadway, I occasionally sat in on the first Albany circuit, and although Tom had sold his quadruplex patent to Jay Gould for $30,000, the last stick of sealing wax he had been gnawing from when he quit was still reposing on the table behind the sounder...
...quadruplex message problem was solved by Thomas Alva Edison...