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Item#TypeModel No.Match No.Variant No.Model NameMakerCountryProduction or Serial No.MaterialScale LengthDateCondition
KEU558Linear
N4102
4405
n/a
Surveyor's DuplexKeuffel & EsserUSA
663806
Engine divided celluloid laminated mahogany
"20"
1939
C5

Notes: "Improved glass indicator. Model number: . Patent notation changed to PAT.1,930,852. Scale label changes: Vert and Hor changed to VERT and HOR; Sin, Cos, and Tan changed to sin, cos, and tan."

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