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.
Some people are surprised to find that the concept, and use, of three reichs is not a solely Nazi idea, but a common component of German historiography. This misconception stems from the use of 'Reich' as totalitarian nightmare, and not as empire. In this article your Guide will examine the institutions referred to as reichs, and explore how they compare. The First Reich: The Holy Roman Empire (800/962 - 1806). Although the name dates to the twelfth century reign of Frederick Barbarossa, the Holy Roman Empire was created over 300 years earlier.