Holt канцэпты і прататыпы

Holt Prototype #77 '1904

Holt Prototype #77 '1904

The first steam-powered track-type tractor.

Комбайны

Holt gasoline-powered tractor prototype '1906

Holt gasoline-powered tractor prototype, Бенджамин Холт

WheelsAge.org '2005–н.ч.