Notes: "This is a standard Mannheim slide rule by Dennert by Dennert & Pape of Altona, The most interesting thing about this slide rule is that it not only has the “Dennert & Pape” name on it, but that name is prominently displayed on the front face of the slide rule, not buried in the well under the slide. The front face has the usual A, B, C, and D scales, and the back of the slide has S, L, and T scales. "
