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12"/10" Novo-Duplex Slide Rule
Shown New, in the factory box, with clear/green display case and manual. Spectacular plastic body rule with many line cursor (with tension adjustment), two color (red/dark green) scale markings, trademark mint green accent stripes on primary scales, over-range scale extensions, expanded trig and log log scales, dual square root/square root 10x scales (w), pythagorean scale and folded scales. The rule is self documenting on right hand side for all scales. Features heavy end braces with rubber anti-skid risers (prevents cursor damage when set on a destop) This rule is an outstanding Faber-Castell rule, and is made in an even larger body size and with more capability in the 2/83N version.