Tag : Dryden Construction

Classic Machines Tractors

The Allis-Chalmers HD-20, last of A-C’s GM-powered Crawlers

Contractor Magazine
A big tractor in its day, The Allis-Chalmers HD-20 was another part of the power struggle that took place between Allis-Chalmers and International-Harvester during the...
Classic Machines

Classic Machines: the LeTourneau Tournacranes

Contrafed PUblishing
While a great many of LeTourneau’s inventions were designed for earthmoving purposes, some of his creations had very practical applications elsewhere. By RICHARD CAMPBELL There...
Classic Machines Tractors

Classic Machines: The International TD-24 tractor

Contrafed PUblishing
As soon as material constraints were removed prior to the end of WW2 the major earthmoving machinery companies set about designing new equipment to cater...
Classic Machines Tractors

Classic Machines: The Allis-Chalmers HD-19 tractor

Contrafed PUblishing
 Allis-Chalmers was the first heavy machinery builder to enter the big track-type tractor development race immediately following World War II. Richard Campbell looks at its...
Classic Machines Tractors

Classic Machines: The Allis-Chalmers HD-20 tractor

Contrafed PUblishing
In production for just three years, the HD-20 was the stepping stone between the powerful HD-19 and the very successful HD-21. RICHARD CAMPBELL delves into...
Classic Machines Tractors

Classic Machines: the International-Harvester TD25 tractor

Contrafed PUblishing
Following on from its very successful model TD24, International Harvester introduced its successor, the TD25 in 1959. Rather than being a scaled up version of the TD24,...