div class=trans-pagebuttonPage 1button div class=trans-image amp-img class=trans-thumb alt=Page 1: Print - imagery Infographicpdf · 2013 10 25 · cost of towers the last commercial ne was abandoned in 18803 1870 but the cost was too high to introduce the technology src=https:reader033fdocumentsnlreader033viewer202206091460a7f9e1b35a3900794752c3html5thumbnails1jpg width=142 height=106 layout=responsive amp-img divdiv