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Details and Image



Item#TypeModel No.Match No.Variant No.Model NameMakerCountryProduction or Serial No.MaterialScale LengthDateCondition
KEU656Linear
68-1607
4140
n/a
Polyphase Mannheim AdjustableKeuffel & EsserUSA
720016
Engine divided celluloid laminated mahogany
"20"
1963
C4

Notes: Narrow improved unbreakable indicator. Lower rail pinned. New K&E Conversion Table. Model number changed to new number system (68 to designate slide rule and 1607 to designate unique model number).

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