Inspecting more than a million dollars’ worth of the newest in earthmoving equipment at the Caterpillar Tractor Co. exhibit at the 1957 Road Show.

Included were the world’s largest successful crawler, the 29-ton, 320-horsepower Caterpillar D9 Tractor and the 300-horsepower rubber-tired CAT DW21 Tractor with the new No. 470 Lowbowl Scraper.

(left to right) D.J. Thompson; T.M. Reilly; J.W. Hardison; Chet Armour; F.I. Isaacson; Jack McCarthy; Elmer Sweet.