The poor man’s quadrant fader

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ADM had a clever (patented) design they called Slidex (pix attached).
Patented a motion transfer from linear to rotation with helicoid !?! man...
Remind me this great scene in the movie (adaptation) from H.G.Wells where the Tripods still dumb by turning a bicycle wheel :)

By the way... early Studer tube mixer from 50' use this exact idea.

Here is a copy of the ADM Slidex fader patent.
I didn't doubt your words Bri !

I'm just puzzled with this kind of patent, especially when now I see it's from the 70' !
Still I'm not expert in patent and all strategy that may play around.