German Klaus von Klitzing (b. 1943), winner of the 1985 Nobel Prize in physics, demonstrated that under appropriate conditions the electrical resistance of a conductor varies only in the discrete jumps (quantum-Hall-effect), which are directly related to the so-called fine-structure constant.
Discovered on 21-9-1992 in Tautenburg by Borngen, F., Schmadel, L. D.