Bruning 2401* 5in Slide Rule and Leather Case F*S Mid Century There are 6 covered access

There are 6 covered access ports 6x13”

that's ~ 3000 Hermes typewriters

When the rocker is released the needle remains clamped in place making transfer of the reading to the "computer" ring much easier

This is a high quality extruded aluminum tripod

commercial office typewriter designed for the student - home user - or small business

Bruning 2401* 5in Slide Rule and Leather Case F*S Mid Century There are 6 covered accessBruning 2401 5in Slide Rule and Leather Case Really neat and very practical 1960s 5 inch plastic rule #2401 Simplex With Bruning Leather Slipcase. 5" scale, with 6" total length. Scales on both sides of the center post. Front Scale 12. 5cm A [ B, CI, C ] D, K \\ 5in Back Scale: [S, L, T ] Leather slipcase is unmarked, Made in the USA FREE standard shipping to the 48 contiguous United States