I live in France for part of the year and I have twice encountered Ahel enlargers in commercial darkrooms. They are quirky in design, much like French cars of the fifties, but work well in a cramped darkroom because the one device can cope with whatever format comes in the door. But one user, sadly now closed down, complained of the finnicky height adjustments -- coarse and fine.
From an engineering point of view the Ahel is an interesting application of (then novel) aluminium extrusion technology.
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