Detail
Type Hrgr. - Mühlengraben is a Häusergruppe (Group of Houses).
Kr Achim - The Kreis for Mühlengraben is Achim. A Kreis is a government district (similar to a U.S. county).
See Bockhorst - A See notation means the entry is dependent on another entry. In this case, Mühlengraben is dependent on Bockhorst, which should be consulted for additional information.