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Item#TypeModel No.Match No.Variant No.Model NameMakerCountryProduction or Serial No.MaterialScale LengthDateCondition
KEU185Linear
4061
4166
3
DuplexKeuffel & EsserUSA
39
Engine divided celluloid laminated mahogany
"6"
1911
C5

Notes: "Metal framed glass "clamshell" indicator with 1 cursor lines. L-shaped brackets. Model number on left end of slide. KEUFFEL & ESSER CO.N.Y. on front below D scale and PAT.JUNE 5,'00 DEC.22,'08 on reverse below D scale."

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