earth-return telegraph
... that the first earth-return telegraph was set up along the Nuremberg–Fürth railway line in 1838?
... that the first <b id="mwBjg"><a href="./Earth-return_telegraph" id="mwBjk" rel="mw:WikiLink" title="Earth-return telegraph">earth-return telegraph</a></b> was set up along the <a href="./Bavarian_Ludwig_Railway" id="mwBjo" rel="mw:WikiLink" title="Bavarian Ludwig Railway">Nuremberg–Fürth railway line</a> in 1838?