Not really all of them, but a pair of CL4 (unless I'm wrong) is rotting somewhere in our lab's barn
All as you describe, right, three rod column, 6x9, but the condensor lenses were just crap - made by molding not grinding, with AWFUL irregularities inside. So the only choice was a matted screen. Or an another condensor. But Krokus MF enlargers were at least available in USSR, unlike the others... and now they cost here next to nothing, like $10, or there are people just giving them away.