div class=trans-pagebuttonPage 1button div class=trans-image amp-img class=trans-thumb alt=Page 1: ABB Groupthe Ward-Leonard system proved to be a much improved speed control for mine hoists ABB supplied such a system as early as 1904 However the Ward-Leonard sys- tem had src=https:reader034fdocumentsinreader034viewer20220501105f47787186234b4fa85cec25html5thumbnails1jpg width=142 height=106 layout=responsive amp-img divdivdiv class=trans-pagebuttonPage 2button div class=trans-image amp-img class=trans-thumb alt=Page 2: ABB Groupthe Ward-Leonard system proved to be a much improved speed control for mine hoists ABB supplied such a system as early as 1904 However the Ward-Leonard sys- tem had src=https:reader034fdocumentsinreader034viewer20220501105f47787186234b4fa85cec25html5thumbnails2jpg width=142 height=106 layout=responsive amp-img divdivdiv class=trans-pagebuttonPage 3button div class=trans-image amp-img class=trans-thumb alt=Page 3: ABB Groupthe Ward-Leonard system proved to be a much improved speed control for mine hoists ABB supplied such a system as early as 1904 However the Ward-Leonard sys- tem had src=https:reader034fdocumentsinreader034viewer20220501105f47787186234b4fa85cec25html5thumbnails3jpg width=142 height=106 layout=responsive amp-img divdivdiv class=trans-pagebuttonPage 4button div class=trans-image amp-img class=trans-thumb alt=Page 4: ABB Groupthe Ward-Leonard system proved to be a much improved speed control for mine hoists ABB supplied such a system as early as 1904 However the Ward-Leonard sys- tem had src=https:reader034fdocumentsinreader034viewer20220501105f47787186234b4fa85cec25html5thumbnails4jpg width=142 height=106 layout=responsive amp-img divdiv