WOTAN Sn 205/13L, Sn200 and Sb200 Internal Grinding Machines. Operating Manual including a large Electrical Schematic and separate Operating Instructions
for Fortuna Grinding Spindles and SIG Screw Pumps. 
 

WOTAN RJ17 and RJ33 Internal grinding machines. Not a manual, but a detailed Sales, Technical Specification and Accessories Catalogue that also includes some essential details of how the machines operate and how to use them and employ the accessories.24 pages.

WOTAN S 317/12U Internal Grinder. Five large Electrical Schematics.

WOTAN all-models Grinders Catalogue 1930s- 1940s that includes the external, internal and surface grinding machines RJ12, RJ17, RJ23, RJ30, RJ33 H15, H16, FH29, V31, RP37, and W26. 8 Pages.