There is a more or less perpetual discussion of half roll vs. tangential suspensions for compression drivers. The half rolls tend to be a bit less extended, though possibly cleaner sounding than the tangentials, which tend to be more extended at the cost of a "tsss tsss" tizz on top.

The study of all this prewar sound gear is great fun. When I started researching it over twenty years a go a few original participants were still kickin', but they are all gone now. The late John Eargle of JBL had it better, as he was hired as a consultant to write a JBL corporate history in the late 1970s, when quite a few of the important folks were still available for interview.