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Reference.org
Development mule
open-in-new
<p>A development mule, also known as test mule or simply mule, in the <a href="/facts/Automotive_industry/fGFKUIlA">automotive industry</a> is a <a href="/facts/Testbed/ITQIUXFc">testbed</a> vehicle equipped with <a href="/facts/Prototype/q0yPLYdb">prototype</a> components requiring evaluation. They are often camouflaged to cover their designs. </p>