Assertion: mild steel's property | /r/CapableOf | discover in semiconductor diode junctions
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text: A non-linear resistance property of the blued steel of razor blades, foreshadowing the same property later discovered in semiconductor diode junctions, along with the ready availability of blued steel razor blades, led to the use of razor blades as a detector in crystal set AM radios that prisoners of war often built during World War II.