No tracks: Austrian, Klemens Torggler’s pivoting door systems are based on rotating squares. See Blogroll for a link to his site. February 19, 2014 · by Decanter · in innovation, product. · Share this: Click to share on X (Opens in new window) X Click to share on Facebook (Opens in new window) Facebook Click to share on LinkedIn (Opens in new window) LinkedIn Click to email a link to a friend (Opens in new window) Email Click to print (Opens in new window) Print Like Loading... Related