1958 Robbins Myers Propellair Fan Noise Slide Rule Calculator Ohio Instructions

Description

1958 Propellair Fan-Noise
Slide Rule Calculator with the Instruction Packaging.  This
Slide Rule Calculator is from the Propellair Division of Robbins & Myers, INC of Springfield, Ohio.
The slide rule calculator and its packaging remain in very good condition.  The calculator is 9-3/16" x 4".  There isn't any marks on the calculator or envelope .
Thank you for your interest in this item.  Please contact me for international shipping concerns.