Detail
Type Ml. - Petersmühle is a Mühle (Mill).
Kr Schlüchtern - The Kreis for Petersmühle is Schlüchtern. A Kreis is a government district (similar to a U.S. county).
See Heubach vor der Rhön - A See notation means the entry is dependent on another entry. In this case, Petersmühle is dependent on Heubach vor der Rhön, which should be consulted for additional information.
Vgl Petermühle - A Vgl (Vergleiche) notation lists places with similar spellings that you may want to compare. In this case, you may want to try searching for Petermühle.