Major types of positive-displacement pumps include: 1  Roots. 2  Lysholm twin-screw. 3  Sliding vane. 4  Scroll-type supercharger, also known as the G-Lader.
I believe that the first Reich refers to the establishment of the Holy Roman Empire in the 9th century was Charles the Great. The Second Reich was the unification of Germany under the Prussian Kaiser Wilhelm II in 1870. Of course, we all know what the Third Reich was. The First Reich was the Holy Roman Empire. There is little agreement as to when it was founded. Most German historians date the foundation from the coronation of Otto I in 962. That 'empire' had a continuous existence till 1806. The Second Reich was created by Bismarck in 1871 and lasted till 1918.
1 Heiliges Roemisches RÃ¶misches, reich The Holy Roman, empire which lasted from the coronation Of Otto i as A Holy Roman emperor in 962 to, 1806 when it was dissolved during The Napoleonic;  warsn the case of the Hohenzollern Empire (1871â1918), the official name of the country was Deutsches Reich (German Realm), because formally the official position of its head of state, in the Constitution of the German Empire, was a  presidency  of a confederation of German states led by the King of Prussia.