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Item#TypeModel No.Match No.Variant No.Model NameMakerCountryProduction or Serial No.MaterialScale LengthDateCondition
KEU111Linear
4041
4658
1
Mannheim AdjustableKeuffel & EsserUSA
16
Engine divided celluloid laminated mahogany
"10"
1900
C5

Notes: First version of the 4041 Mannheim. Has adjustable frame via three screws and one cut out on back of slide rule to read scales on reverse of slide. Metal framed glass indicator with two cursors. KEUFFEL & ESSER CO. NEW-YORK on frame.

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