JUNG (Jungenthal) F50 N Surface Grinder. Manual JUNG (Jungenthal) F50 N Surface Grinder. Operating Instructions with an Electrical Schematic and a manual for the Bosch Oil Pump Types MU and MSU. Manufacturers: Jung Jungenthal Bosch MU MSU Models: F50 N F50-N MU MSU Contents: Operators Manual Electrical Diagrams Catalog