Classic Machines TractorsClassic Machines: Caterpillar’s D7 tractor -‘the early years’Contrafed PUblishingApril 27, 2018June 12, 2020 by Contrafed PUblishingApril 27, 2018June 12, 2020 The iconic Caterpillar D7 has been in continuous production in various versions since 1935. They have fought in three major conflicts – WWII, Korea &...