Physical description
White & Gillespie “Dualface” comprehesive slide rule Model 432 In original cloth covered case
Inscriptions & markings
“Dual face” Comprehensive Slide Rule Model 432 Melbourne > W&G
White & Gillespie “Dualface” comprehesive slide rule Model 432 In original cloth covered case
“Dual face” Comprehensive Slide Rule Model 432 Melbourne > W&G