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<div class="hatnote">"BSW" redirects here. For other uses, see <a href="//en.wikipedia.org/wiki/BSW_(disambiguation)" title="BSW (disambiguation)">BSW (disambiguation)</a>.</div>
<p><b>British Standard Whitworth</b> (<b>BSW</b>) is one of a number of <a href="//en.wikipedia.org/wiki/Imperial_unit" title="Imperial unit" class="mw-redirect">imperial unit</a> based <a href="//en.wikipedia.org/wik