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Electromagnetic oscillograph
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<h2 id="external-links">External links</h2> <ul><li><a href="https://web.archive.org/web/20090211063906/http://chem.ch.huji.ac.il/history/duddell.html">William du Bois Duddell</a></li> <li><a href="http://www.freepatentsonline.com/2466691.html">Electromagnetic oscillograph</a></li></ul> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>Scientific Bulletin. Vol. 11. The Office. 1986. p. 104. <a href="https://books.google.com/books?id=4Y7q09PK7mUC" target="_blank">https://books.google.com/books?id=4Y7q09PK7mUC</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> </ol>