K&E 4055 --- 10" Laminated Mahogany Mannheim Slide Rule
All glass cursor with ridges on end blocks
Note: This rule is identical to Specimen #1 except that printing on the top part of the rule is in different order and the case is a slip case. This printing change probably represents a tooling change in about 1934. This change is seen in later 4055s.
From the collection of Clark McCoy
Back of slide
Left end view