$29.56

Vintage Anker Adjustable Square Made in England Fluorescent Drafting Tool

$6.79

1960 Professional Engineering Examinations Mechanical Problems NY State engineer

$33.67

Vintage EMU No 236-19 Germany Draughtsmen Technical Drawing Set Original Instrum

$228.93

Boxed Hilger & Watts TB 107-1 M C Clinometer Vernier Angle Gage

$7.95

Deck Machinery Propulsion of Vessels. 1933. Internat. Textbook Co. Hardcover.

$33.99

VINTAGE BRITISH THORNTON COMPREHENSIVE WHITE SLIDE RULER ENGINEERS SCALE RULE

$64.64

Brass Sundial & Compass Replica Maritime Navigation Aid

$10.77

Faber Castell 57/87 Students Advanced Rietz Model Slide Rule Made In Austria

$74.06

Antique Victorian Rolling Ruler, Brass And Ebony Stanley Make

$16.01

Vintage Aristo No.99 Slide Ruler with Worn Case Drafting Tool

$11.65

66 RARE SLIDE RULE BOOKS ON USB - CALCULATOR SLIPSTICK MENSURATION SCIENCE MATHS

$20.19

Thornton P271 Log Log 10" Slide Rule With Plastic Case Vintage Made In England