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Item#TypeModel No.Match No.Variant No.Model NameMakerCountryProduction or Serial No.MaterialScale LengthDateCondition
KEU288Linear
4041
4658
3
Mannheim AdjustableKeuffel & EsserUSA
5
Engine divided celluloid laminated mahogany
"10"
1901
C6

Notes: Metal framed glass indicator with single cursor. Cut out added on left of slide rule in addition to one on the right to read scales on reverse of slide. Pi (?) gauge mark added to A and B scales.

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