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.
After assuming power in 1933, Hitler proclaimed the Third Reich, which became the Great German Reich after the annexation of Austria in 1938 (âHeim ins Reichâ). Since the Empire followed on a, in the eyes of the Nazis, corrupted republic, Hitler placed himself next to Caesar, the Great German Reich was the restoration of the old Holy Roman Empire and was said to exist for 1000 years.