<a href="https://en.wikipedia.org/wiki/Cockcroft-Walton_accelerator" class="extiw" title="w:Cockcroft-Walton accelerator">Cockcroft-Walton accelerator</a>
The original uploader was <a href="https://en.wikipedia.org/wiki/pl:User:NH2501" class="extiw" title="w:pl:User:NH2501">NH2501</a> at <a href="https://en.wikipedia.org/wiki/pl:" class="extiw" title="w:pl:">Polish Wikipedia</a>.
"<i>Encyklopedia techniki</i>", tom "<i>Energia jądrowa</i>", WNT, Warszawa 1970; Transferred from <span class="plainlinks"><a class="external text" href="https://pl.wikipedia.org">pl.wikipedia</a></span> to Commons by <a href="//commons.wikimedia.org/wiki/User:Masur" title="User:Masur">Masur</a> using <a href="https://iw.toolforge.org/commonshelper/" class="extiw" title="toollabs:commonshelper/">CommonsHelper</a>.