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 World War I and the German Revolution of 1918â1919, the Empire was replaced by the parliamentary Weimar Republic. The establishment of the Third Reich in 1933 led to World War II and the Holocaust. After 1945, Germany split into two states, East Germany and West Germany.In 1990, the country was reunified.In the 21st century, Germany is a great power and has the world's fourth-largest economy by nominal GDP, as well as the fifth-largest by PPP.As a global leader in several industrial and technological sectors, it is both the world's third-largest exporter and importer of goods.n the 21st century, Germany is a great power and has the world's fourth-largest economy by nominal GDP, as well as the fifth-largest by PPP. As a global leader in several industrial and technological sectors, it is both the world's third-largest exporter and importer of goods.