$8.42

BLUNDELL HARLING METRIVERTER M1769P in Plastic Sleeve

$13.47

Vintage Rotring R 529 008 Compass In Original Case

$134.66

Professional Adjustable Theodolite Surveyors Aluminium Tripod Stand Instrument

$8

THE CONCRETE ENGINEER'S HANDBOOK, 1921

$40.39

Faber-Castell 4/87 Logarithmic Slide Rule Faber Castell

$33.67

Late 19th/early 20th century draughtsman's set brass in wooden case (SEE PHOTOS)

$25.57

Domestic Central Heating Calculator 1

$17.49

Vintage 12" Unique Log Log Slide Rule Made in England Boxed

$16.16

Sowester Parallel Sliding Rule

$249.14

Antique Architects Railway Curves Set English Needle & Fishing Tackle Co Set

$124.45

ZL180 Handheld GPS for Surveying, High Precision Rugged Land Surveying Equipm...

$59.99

Lot of 2 1923 POWER trade publications Electrical Generation McGraw Hill advert!