Master Duplex A505 slide rule

Made:
1970-1975 in England

W.H. Smith Master Duplex A505 (10-inch) slide rule by Blundell Harling Limited with plastic case

Details

Category:
Mathematics
Object Number:
1998-442
Materials:
plastic and complete
Measurements:
overall: 12 x 350 x 60 mm
type:
slide rule
credit:
Mr J.C. Michie