Baedeker Friedrich's widow Eva Baedeker, née Konitz (1913−1984), piloted the firm until she died in 1984. She was the last Baedeker to play an active role in running the Baedeker publishing house founded in 1827, and negotiated the sale of the Freiburg branch to Langenscheidt before she died. However, the "Karl Baedeker" brand name has been retained by all subsequent owners of the company, in one form or another. Since 1979 Baedeker travel guides have appeared as "Baedeker Allianz Reiseführer" (travel guides), published in collaboration with the German insurance group Allianz. Multi-coloured with copious illustrations and in many languages, they now
Karl Baedeker (scientist) This was the first example of doping a semiconductor to change its properties and also the discovery of transparent conductive materials. He also observed a Hall effect in transparent copper iodide thin films that had the reverse sign to that in copper, an observation of what was later to be known as conduction by electron holes in semiconductors. This observation was critical in developing the theory of electron conduction in solids. Along with his graduate student Karl Steinberg, Baedeker studied the effect of varying concentration of iodine on the electrical properties of copper iodide. He also is credited with making