K&E 4055 --- 10" Laminated Mahogany Mannheim Slide Rule
All glass cursor with ridges on end blocks
Note: This rule is identical to Specimen #2 except that printing on the top part of the rule is in different order and the case has a snap down flap. This printing change probably represents a tooling change in about 1934. This rule has a serial number 40,000 earlier than specimen #2.
From the collection of Clark McCoy
Back of slide
Left end view