Bosch magneto circuit (Army Service Corps Training, Mechanical Transport, 1911).jpg
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1911
Scan from <cite class="book" style="font-style:normal">(1911) <i> Mechanical Transport</i>, <a href="https://en.wikipedia.org/wiki/HMSO" class="extiw" title="en:HMSO">HMSO</a>  <small></small></cite>