USD $95
This is an early version Ivorite body Jet Math Pocket rule from K+E, with green leather pocket sheath case, and softcover manual.
This K+E pocket rule has an unbreakable improved cursor and white body with black engraved and filled scales. A very attractive rule, and complete in a factory boxed set. This rule has folded (CF/DF) scales at pi, with the trig scales in decimal degrees. The back is blank, but the slide is reversible with trig scales (T, ST, S, C). The pic shows the actual box condition, and all the parts offered for sale.
(12 Scales)
Front – K, DF, CF, L, CI, C, D, A [ T, ST, S, C]
Back – Blank
Stock: 2
Sphere Research Corporation