-40%
Vintage Slide Ruler • Friction Loss Calc by Ductile Iron Pipe Research Assn
Vintage Slide Ruler • Friction Loss Calc by Ductile Iron Pipe Research Assn
Vintage Slide Ruler • Friction Loss Calc by Ductile Iron Pipe Research Assn

Vintage Slide Ruler • Friction Loss Calc by Ductile Iron Pipe Research Assn

$ 6.31

  • Country/Region of Manufacture: United States

Description

A vintage slide ruler that calculates friction loss given a number of inputs. Seems to have been a sales advertising piece by the Ductile Iron Pipe Research Association.