Saw this on another site, thought hoe Smalley, but built by a small northern firm. Hoe likely later than tractor. It shows the origin of the TBL as affordable additions to a mass market tractor that already existed. Makers lost the plot, chasing one another up the tree with curved tinted windscreens, extendahoe, forks, 4 in 1 all becoming standard until the thing was top heavy & vastly over priced for what most users needed. Think white fuel the final tin lid
TBL's took over from small cable machines like the Priestman Cub, wheel has now turned full circle with 7.5t midi back where the Cub was in the early '50s.
I would not enjoy changing from backhoe to tractor on the above, every time the trench moved forward! but no doubt better than a 1 RB