This derailleur was amazingly innovative. It is a proper parallelogram design, mounting on the drop out, with a low gear stop screw. With all this technology it came on to the market 5 years before Campagnolo’s Gran Sport.
Why is it a forgotten irrelevance? Probably because it was a single pulley design - and so doomed to uselessness.
The Super JIC Course is exceedingly similar to the Super-Inax Sport in this collection, with the crucial difference that the Super JIC Course is bronze and the Super-Inax Sport is aluminium. They are so similar that I have assumed that they came from the same manufacturer.
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