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Item#TypeModel No.Match No.Variant No.Model NameMakerCountryProduction or Serial No.MaterialScale LengthDateCondition
KEU561Linear
4071T
4196
1
Duplex TrigKeuffel & EsserUSA
none
Engine divided celluloid laminated mahogany
"10"
1909
C5

Notes: "Metal framed glass "clamshell" indicator. L scale on top edge; S & T trig scales on front and back of slide respectively. C-shaped brackets facing outward with rivets and screws. PAT.OCT.6.1891 PAT.JUNE 5.1900 below D scale on rear."

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