10-Inch Mannheim Multiphase Slide Rule
Post model 1452 [1925-30]
 

This idential page appears in the 1925, 1927 and 1930 Post catalogs. 
In gutter: "FREDERICK POST CO.   MADE IN GERMANY."

This rule was made by Koch, Huxhold & Hannemann.

Rules described as "adjustable" use the DRGM 192052 friction adjusting mechanism