Name	Keuffel & Esser 4090 Universal, 2 attached slides, dated 1901?, 1903?
Front Scales	A = B C = D DF = C S = A
Back Scales	A = BI CI = D DF = CI L T = D
Type of Rule	slide rule
Material	engine divided celluloid laminated mahogany
Dimension (mm)
Area of Use	generic
Origin of Rule	Conrad Shure
Match Number	4313
Comment
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