Electrophone
... that the Electrophone relayed theatre shows, opera performances, and church services over telephone lines?
... that the <b id="mwBjI"><a href="./Electrophone_(information_system)" id="mwBjM" rel="mw:WikiLink" title="Electrophone (information system)">Electrophone</a></b> relayed theatre shows, opera performances, and church services over telephone lines?