VINTAGE JOHN RABONE & SONS 24” BOXWOOD & BRASS FOLDING RULE

Vintage 1930's Mathematical Brass + Boxwood instruments Compass in Original Box

J Halden & Co Manchester London Vintage Wood Engineers Rule Ruler Engine Divided

Vintage Sun Hemmi Bamboo Slide Rule No 130 System Darmstadt Original Box

JETS Slide Rule Pin - Junior Engineering Technical Society - 1.25” 1950s Vintage

VINTAGE BOXWOOD SCALE RULER 6" Engine Divided

VINTAGE JOHN RABONE & SONS No 1378 BOXWOOD & BRASS FOLDING RULE & OTHER (CD4)

UNUSUAL VINTAGE SMALL WOODEN SLIDE-RULE ADVERTISING AN AMERICAN ENGINEERING CO.