The Spielberger German Armor and Military Vehicle SeriesThis book is the final documentation on the Panzerkampfwagen IV series, the most often built German tank of World War II and presents the exact chronology of the vehicles development from 1935 45, plus many hitherto unknown and pioneering test vehicles. The authors discuss the origin of the Large Tractor, the so called Neubau (New Built) Vehicle and the attempts in 1944 to install the 7. 5 cm Kampfwagenkanone 42 L 70 of the Panther onto the Panzer IV.