Historical Construction Equipment Association (HCEA)

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LeTourneau’s Self-Propelled Scraper was many years ahead of its time in both its concept and powertrain. It’s doing work a tractor-drawn scraper could not, discharging fill to the end of a levee with its front axle chocked.
The First Self-Propelled Scraper
LeTourneau sold the Mountain Mover to an Eph Hahn in 1926. Here it is, sporting modifications made by the Hahns, including solid steel front wheels in place of the original spoked wheels and lowering the framework above the scoop to make it easier to transport.
The Mountain Mover
R. G. LeTourneau operates his Holt 75 crawler tractor and his Full-Drag scraper, the first scraper designed to be operated from a tractor.
The First Tractor-Controlled Scraper
R. G. LeTourneau
The Great Innovator R. G. LeTourneau
Kilgore Machine Company built the first all-hydraulic excavator, known as the Direct Acting excavator, which was also offered in a 1-1/4 yard traction version for use off railroad tracks.
10 Years of Innovation: Hydraulic Excavators Have Come a Long Way
A conventional Fresno scraper. The earliest version had small wheels on the leading edge in place of the side runners.
The Fresno Scraper
Operator aerobics! A Smith & Sons Royal riding wheeled scraper gave a man a workout, leaning forward and back on the platform to operate the scraper while keeping the team under control. This is his position during dumping.
The First Wheeled Scrapers
Etching of a mouldebart, the earliest known scraper.
The First Scrapers
A closer look at an early Deere 570 with articulated frame.
The First Articulated Motor Grader
The Austin-Western 99 series was the first motor grader with all-wheel steering, all-wheel drive, crab steering and fully hydraulic blade control.
The Austin-Western 99 Motor Grader
Being the world’s first integral motor grader, the Auto Patrol was marketed heavily to states for road maintenance. This image from a 1932 Caterpillar advertisement shows one at work behind the Arkansas State Capitol.
The First Modern Motor Grader
A 1-yd. Slackline Dragline bucket brings in a load of wet gravel.
The Slackline Dragline and Tower Machine
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