ANTIQUE ENGINEERS HALDEN CALCULEX CIRCULAR SLIDE RULE INSTRUCTION BOOK & CASE

FOWLER'S TEXTILE CALCULATOR - LEATHER CASE & CHROME RIM - FOWLER & CO

Vtg Odd Lot - Trigonometer / Engineering Tool & Case, Tin, Bulldog, Lufkin, Wood

Antique Hudson’s Computing Scale Engineer Pocket Calculator Pump Slide Rule

Cooke Troughton & Simms Engineering Slide Rule Vintage Collectable

Halden Calculex various parts for spares see pictures

Vintage Diwa Denmark Polylog No.930 Slide Rule Ruler With Leather Case

Architects Trammels for Beam Compass Draughtsmans Trammel Set Complete With Box.