Holt concetti & prototipi

Holt Prototype #77 '1904

Holt Prototype #77 '1904
 
 
 

The first steam-powered track-type tractor.

Holt gasoline-powered tractor prototype '1906

Benjamin Leroy Holt e Holt gasoline-powered tractor prototype
 
 
 

WheelsAge.org '2005–pres.