Queenslander, what year is that Huber-Warco grader ad? With torque converter drive, powershift transmission, and a powered sideshift for the mouldboard, the machine would have been a dream to drive as compared to the old knuckle-buster, Cat 12 competition!
Cat always sneered at hydraulic graders and claimed that only Cats mechanical lift and lower would hold a precise position endlessly. In the era of 800-100psi hydraulics and leather hydraulic seals, they probably had a good selling point!
However the biggest selling point of the Cat 12's was their sheer reliability. They had their faults, but their reliability was legend.
For a machine designed in the mid-1930's and released in late 1937 and produced largely unchanged for decades, it shows how good the basic design was.
I have a copy of the release brochure for the Cat 12 dated 1937, it's a substantial piece of advertising with some great photos, designed to make the competition look like Roman chariots.