1950 .....Model " D "  Roadster........7 YD ..... [ 9 Ton ].....Motor Scraper

MAKER:    R.G. Letourneau, Inc.    Peoria, Ill........LeTourneau  Tournapulls Scrapers

The first ever of any kind was invented in 1937-----Letourneau four wheel self-propelled scraper [ Tournapull ] was all electric wheel drive.