Holt 概念 & 原型

Holt Prototype #77 '1904

Holt Prototype #77 '1904
 
 
 

The first steam-powered track-type tractor.

Holt gasoline-powered tractor prototype '1906

Holt gasoline-powered tractor prototype, Benjamin Leroy Holt
 
 
 

WheelsAge.org '2005–至今