This is a good discussion. In the CASE world, as far as I know, in the non power master cyls, CASE always recommended the use of their TCH oil. Even in the early 70 Series where the brakes were outside, completely isolated from the tranny. TCH and Hy Tran are "Transmission-Hydraulic Oils". A much better choice than straight hydraulic oil in a hydraulic or tranny situation because "Tranny-Hyd." oil not only contains the anti foaming qualities of the hyd. oil, but also the Extreme Pressure (EP) protection qualities, not found in straight hyd. oil.
The CASE "Hydraulic Brake Mineral Oil" is a sales gimmick, with very high profit margin. To be labeled a "Hydraulic" oil, it must contain the anti foaming qualities of a hydraulic oil, but no where does it say it contains the "EP" qualities of a tranny oil. This oil if super fine in a brake system that requires mineral oil, but to say or imply it is superior to TCH or HY Tran or any Transmission Hydraulic Oil is not true.