Field Marshal, and Lanz Bulldog tractors were coup;ed in tandem
Not needed in Britain until the 1960s, apart from the odd installation. Our 50HP tractor was sufficient for most draft use and smaller units, with 3 point linkage and hydraulics, became commonplace.. Ernest Doe changed all that until the Fordson (or was it Ford again by then?) Super Sixes and later 4 wheel drive tractors were trundled out by the manufacturers.