Kunze envisaged a "fractal" vise using a number of freely rotating semi-circular grips, smaller ones nested within the larger ones, such that as the vise is tightened on an object, the grips are ...
https://mics-surveys-prod.s3.amazonaws.com/MICS5/West%20and%20Central%20Africa/Guinea/2016/Final/Guinea%202016%20MICS_French.pdf ...